Mercer
Company Details
Linkedin ID:
mercer
Website:
Employees number:
23,248
Number of followers:
825,190
NAICS:
54
Industry Type:
Homepage:
mercer.com
IP Addresses:
0
Company ID:
MER_2912758
Scan Status:
In-progress
Mercer Company CyberSecurity Posture
mercer.com
At Mercer, we believe in building brighter futures. Together, our 25,000 employees in over 130 counties are helping redefine the future of work, reshape retirement and investment outcomes, and unlock real health and well-being. For over 75 years, we’ve provided trusted advice and solutions to build healthier and more sustainable futures for our clients, colleagues and communities. Balancing economics and empathy in our approach, we work side by side with you to find solutions to benefit your people and your business. By turning ideas into actions that spark positive change, we help you enrich employees’ lives and careers and drive innovation, progress and performance. Mercer is a business of Marsh McLennan. Get to know us better: Click the “learn more” button at the top of the page to discover everything we do to help you meet the needs of today and tomorrow. Follow us on Twitter at @Mercer.
Mercer A.I CyberSecurity Scoring
Mercer Risk Score (AI oriented)Between 750 and 799
Mercer
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Mercer Global Score (TPRM)XXXX
Mercer
- Instant access to detailed risk factors
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- Findings
Mercer Company CyberSecurity News & History
Past Incidents
3
Attack Types
2
Marsh & McLennan Companies, Inc.
Breach
Rankiteo Explanation
Attack with significant impact with internal employee data leaks
Description: The California Office of the Attorney General reported a data breach involving Kroll Background Screening Services, a subsidiary of Marsh & McLennan Companies, Inc. The breach occurred between June 2013 and September 2013, resulting in unauthorized access to personal information, including names and Social Security Numbers. The breach notification was reported on November 26, 2013.
Marsh McLennan
Breach
Rankiteo Explanation
Attack with significant impact with customers data leaks
Description: The Washington State Office of the Attorney General reported that Marsh McLennan experienced a cyberattack involving unauthorized access to personal information on April 22, 2021, which was discovered on April 26, 2021. The breach potentially affected 2,550 Washington residents, with compromised information including names, Social Security numbers, driver's license numbers, and health insurance information. Notifications to affected individuals began on June 30, 2021.
Marsh McLennan
Data Leak
Rankiteo Explanation
Attack limited on finance or reputation
Description: Marsh & McLennan Cos. Inc. was hit by a data breach in April involving access to Social Security numbers and other personal information of staff, former staff, clients and a range of other people linked to the brokerage. Marsh McLennan notified that the breach involved a limited set of data and it reset system access rights and imposed additional restrictions. The information involved included names, Social Security numbers or other federal tax identification numbers. The company offered complimentary credit monitoring for two years, identity theft detection and resolution services and up to $1 million in identity theft insurance coverage.
Mercer Company Scoring based on AI Models
Cyber Incidents Likelihood 3 - 6 - 9 months
A.I Risk Score Likelihood 3 - 6 - 9 months
Underwriter Stats for Mercer
Incidents vs Professional Services Industry Average (This Year)
No incidents recorded for Mercer in 2025.
Incidents vs All-Companies Average (This Year)
No incidents recorded for Mercer in 2025.
Incident Types Mercer vs Professional Services Industry Avg (This Year)
No incidents recorded for Mercer in 2025.
Incident History — Mercer (X = Date, Y = Severity)
Mercer cyber incidents detection timeline including parent company and subsidiaries
Mercer Company Subsidiaries
At Mercer, we believe in building brighter futures. Together, our 25,000 employees in over 130 counties are helping redefine the future of work, reshape retirement and investment outcomes, and unlock real health and well-being. For over 75 years, we’ve provided trusted advice and solutions to build healthier and more sustainable futures for our clients, colleagues and communities. Balancing economics and empathy in our approach, we work side by side with you to find solutions to benefit your people and your business. By turning ideas into actions that spark positive change, we help you enrich employees’ lives and careers and drive innovation, progress and performance. Mercer is a business of Marsh McLennan. Get to know us better: Click the “learn more” button at the top of the page to discover everything we do to help you meet the needs of today and tomorrow. Follow us on Twitter at @Mercer.
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Mercer CyberSecurity News
June 19, 2025 07:00 AM
Mercer student creates AI curriculum for youth as part of summer research project
A Mercer student is creating a curriculum that introduces AI and cybersecurity to elementary and middle school students as part of her...
April 20, 2025 10:50 AM
2025 Cybersecurity Insights for Financial Services
The 2025 People Risk in Cybersecurity Report for Financial Services offers vital insights into the current state of cybersecurity in Europe, emphasizing the...
April 16, 2025 07:00 AM
Super funds scramble to close cybersecurity gaps
Super funds' adoption of a key security measure remains patchy even in the aftermath of a co-ordinated cyberattack that resulted in member...
April 06, 2025 07:00 AM
Cybercriminals impersonated super executives in week of mass breach
The attacks occurred in the same week hackers compromised the largest funds and siphoned retirement savings out of member accounts.
April 04, 2025 07:00 AM
Australian superannuation funds hit by cyber attacks, with members' money stolen
A number of Australian superannuation funds have been hit with suspected cyber attacks, with members of one fund losing at least $500000 in...
March 31, 2025 08:53 PM
Mercer County Joint Township Community Hospital Data Breach
Info exposed in the Mercer County Joint Township Community Hospital data breach? If you got a letter in the mail, you could take legal action and recover...
March 28, 2025 07:00 AM
Faculty and Staff Notables | April 2025
Dr. Karyn Allee, assistant professor of elementary education, was honored with Mercer's Edward L. Bouie Excellence in Research and Scholarship Award.
March 24, 2025 07:00 AM
You could have lost $5,950 ― New data breach settlement confirmed
A data breach at Mercer University led to a $5950 settlement, but if you missed the March 18 deadline, you've lost your chance to claim...
March 20, 2025 07:00 AM
Mercer designated a National Center of Academic Excellence in Cyber Defense
Mercer University has been designated as a National Center of Academic Excellence in Cyber Defense (CAE-CD) by the National Centers of...
Frequently Asked Questions
Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
Mercer CyberSecurity History Information
Official Website of Mercer
The official website of Mercer is http://www.mercer.com.
Mercer’s AI-Generated Cybersecurity Score
According to Rankiteo, Mercer’s AI-generated cybersecurity score is 799, reflecting their Fair security posture.
How many security badges does Mercer’ have ?
According to Rankiteo, Mercer currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
Does Mercer have SOC 2 Type 1 certification ?
According to Rankiteo, Mercer is not certified under SOC 2 Type 1.
Does Mercer have SOC 2 Type 2 certification ?
According to Rankiteo, Mercer does not hold a SOC 2 Type 2 certification.
Does Mercer comply with GDPR ?
According to Rankiteo, Mercer is not listed as GDPR compliant.
Does Mercer have PCI DSS certification ?
According to Rankiteo, Mercer does not currently maintain PCI DSS compliance.
Does Mercer comply with HIPAA ?
According to Rankiteo, Mercer is not compliant with HIPAA regulations.
Does Mercer have ISO 27001 certification ?
According to Rankiteo,Mercer is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Industry Classification of Mercer
Mercer operates primarily in the Professional Services industry.
Number of Employees at Mercer
Mercer employs approximately 23,248 people worldwide.
Subsidiaries Owned by Mercer
Mercer presently has no subsidiaries across any sectors.
Mercer’s LinkedIn Followers
Mercer’s official LinkedIn profile has approximately 825,190 followers.
NAICS Classification of Mercer
Mercer is classified under the NAICS code 54, which corresponds to Professional, Scientific, and Technical Services.
Mercer’s Presence on Crunchbase
No, Mercer does not have a profile on Crunchbase.
Mercer’s Presence on LinkedIn
Yes, Mercer maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/mercer.
Cybersecurity Incidents Involving Mercer
As of November 28, 2025, Rankiteo reports that Mercer has experienced 3 cybersecurity incidents.
Number of Peer and Competitor Companies
Mercer has an estimated 617 peer or competitor companies worldwide.
What types of cybersecurity incidents have occurred at Mercer ?
Incident Types: The types of cybersecurity incidents that have occurred include Breach and Data Leak.
How does Mercer detect and respond to cybersecurity incidents ?
Detection and Response: The company detects and responds to cybersecurity incidents through an containment measures with reset system access rights, containment measures with imposed additional restrictions..
Incident Details
Can you provide details on each incident ?
Title: Marsh & McLennan Data Breach
Description: Marsh & McLennan Cos. Inc. was hit by a data breach in April involving access to Social Security numbers and other personal information of staff, former staff, clients, and a range of other people linked to the brokerage.
Date Detected: April 2023
Type: Data Breach
Title: Marsh & McLennan Companies, Inc. Data Breach
Description: Unauthorized access to personal information, including names and Social Security Numbers, through Kroll Background Screening Services.
Date Detected: 2013-09
Date Publicly Disclosed: 2013-11-26
Type: Data Breach
Attack Vector: Unauthorized Access
Title: Marsh McLennan Data Breach
Description: Unauthorized access to personal information including names, Social Security numbers, driver's license numbers, and health insurance information.
Date Detected: 2021-04-26
Date Publicly Disclosed: 2021-06-30
Type: Data Breach
Attack Vector: Unauthorized Access
What are the most common types of attacks the company has faced ?
Common Attack Types: The most common types of attacks the company has faced is Breach.
Impact of the Incidents
What was the impact of each incident ?
Incident : Data Breach MAR18242223
Data Compromised: Social security numbers, Federal tax identification numbers, Names
Identity Theft Risk: True
Incident : Data Breach MAR307072525
Data Compromised: Names, Social security numbers
Incident : Data Breach MAR919072625
Data Compromised: Names, Social security numbers, Driver's license numbers, Health insurance information
What types of data are most commonly compromised in incidents ?
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Social Security Numbers, Federal Tax Identification Numbers, Names, , Names, Social Security Numbers, , Names, Social Security Numbers, Driver'S License Numbers, Health Insurance Information and .
Which entities were affected by each incident ?
Incident : Data Breach MAR18242223
Entity Name: Marsh & McLennan Cos. Inc.
Entity Type: Company
Industry: Brokerage
Incident : Data Breach MAR307072525
Entity Name: Marsh & McLennan Companies, Inc.
Entity Type: Corporation
Industry: Professional Services
Incident : Data Breach MAR919072625
Entity Name: Marsh McLennan
Entity Type: Company
Industry: Insurance
Customers Affected: 2550
Response to the Incidents
What measures were taken in response to each incident ?
Incident : Data Breach MAR18242223
Containment Measures: Reset system access rightsImposed additional restrictions
Data Breach Information
What type of data was compromised in each breach ?
Incident : Data Breach MAR18242223
Type of Data Compromised: Social security numbers, Federal tax identification numbers, Names
Sensitivity of Data: High
Incident : Data Breach MAR307072525
Type of Data Compromised: Names, Social security numbers
Sensitivity of Data: High
Incident : Data Breach MAR919072625
Type of Data Compromised: Names, Social security numbers, Driver's license numbers, Health insurance information
Number of Records Exposed: 2550
Sensitivity of Data: High
How does the company handle incidents involving personally identifiable information (PII) ?
Handling of PII Incidents: The company handles incidents involving personally identifiable information (PII) through by reset system access rights, imposed additional restrictions and .
References
Where can I find more information about each incident ?
Incident : Data Breach MAR18242223
Source: Marsh & McLennan Cos. Inc.
Incident : Data Breach MAR307072525
Source: California Office of the Attorney General
Date Accessed: 2013-11-26
Incident : Data Breach MAR919072625
Source: Washington State Office of the Attorney General
Where can stakeholders find additional resources on cybersecurity best practices ?
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: Marsh & McLennan Cos. Inc., and Source: California Office of the Attorney GeneralDate Accessed: 2013-11-26, and Source: Washington State Office of the Attorney General.
Stakeholder and Customer Advisories
Were there any advisories issued to stakeholders or customers for each incident ?
Incident : Data Breach MAR18242223
Customer Advisories: Complimentary credit monitoring for two yearsIdentity theft detection and resolution servicesUp to $1 million in identity theft insurance coverage
What advisories does the company provide to stakeholders and customers following an incident ?
Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were Complimentary Credit Monitoring For Two Years, Identity Theft Detection And Resolution Services, Up To $1 Million In Identity Theft Insurance Coverage and .
Additional Questions
Incident Details
What was the most recent incident detected ?
Most Recent Incident Detected: The most recent incident detected was on April 2023.
What was the most recent incident publicly disclosed ?
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2021-06-30.
Impact of the Incidents
What was the most significant data compromised in an incident ?
Most Significant Data Compromised: The most significant data compromised in an incident were Social Security numbers, Federal tax identification numbers, Names, , Names, Social Security Numbers, , names, Social Security numbers, driver's license numbers, health insurance information and .
Response to the Incidents
What containment measures were taken in the most recent incident ?
Containment Measures in Most Recent Incident: The containment measures taken in the most recent incident was Reset system access rightsImposed additional restrictions.
Data Breach Information
What was the most sensitive data compromised in a breach ?
Most Sensitive Data Compromised: The most sensitive data compromised in a breach were Names, Federal tax identification numbers, Social Security Numbers, driver's license numbers, health insurance information, names and Social Security numbers.
What was the number of records exposed in the most significant breach ?
Number of Records Exposed in Most Significant Breach: The number of records exposed in the most significant breach was 255.0.
References
What is the most recent source of information about an incident ?
Most Recent Source: The most recent source of information about an incident are Marsh & McLennan Cos. Inc., Washington State Office of the Attorney General and California Office of the Attorney General.
Stakeholder and Customer Advisories
What was the most recent customer advisory issued ?
Most Recent Customer Advisory: The most recent customer advisory issued was an Complimentary credit monitoring for two yearsIdentity theft detection and resolution servicesUp to $1 million in identity theft insurance coverage.
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Latest Global CVEs (Not Company-Specific)
Description
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to versions 19.2.16, 20.3.14, and 21.0.1, there is a XSRF token leakage via protocol-relative URLs in angular HTTP clients. The vulnerability is a Credential Leak by App Logic that leads to the unauthorized disclosure of the Cross-Site Request Forgery (XSRF) token to an attacker-controlled domain. Angular's HttpClient has a built-in XSRF protection mechanism that works by checking if a request URL starts with a protocol (http:// or https://) to determine if it is cross-origin. If the URL starts with protocol-relative URL (//), it is incorrectly treated as a same-origin request, and the XSRF token is automatically added to the X-XSRF-TOKEN header. This issue has been patched in versions 19.2.16, 20.3.14, and 21.0.1. A workaround for this issue involves avoiding using protocol-relative URLs (URLs starting with //) in HttpClient requests. All backend communication URLs should be hardcoded as relative paths (starting with a single /) or fully qualified, trusted absolute URLs.
Risk Information
cvss4
Base: 7.7
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
References
- https://github.com/angular/angular/commit/0276479e7d0e280e0f8d26fa567d3b7aa97a516f
- https://github.com/angular/angular/commit/05fe6686a97fa0bcd3cf157805b3612033f975bc
- https://github.com/angular/angular/commit/3240d856d942727372a705252f7c8c115394a41e
- https://github.com/angular/angular/releases/tag/19.2.16
- https://github.com/angular/angular/releases/tag/20.3.14
- https://github.com/angular/angular/releases/tag/21.0.1
- https://github.com/angular/angular/security/advisories/GHSA-58c5-g7wp-6w37
Description
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. An Uncontrolled Recursion vulnerability in node-forge versions 1.3.1 and below enables remote, unauthenticated attackers to craft deep ASN.1 structures that trigger unbounded recursive parsing. This leads to a Denial-of-Service (DoS) via stack exhaustion when parsing untrusted DER inputs. This issue has been patched in version 1.3.2.
Risk Information
cvss4
Base: 8.7
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. An Integer Overflow vulnerability in node-forge versions 1.3.1 and below enables remote, unauthenticated attackers to craft ASN.1 structures containing OIDs with oversized arcs. These arcs may be decoded as smaller, trusted OIDs due to 32-bit bitwise truncation, enabling the bypass of downstream OID-based security decisions. This issue has been patched in version 1.3.2.
Risk Information
cvss4
Base: 6.3
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description
Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. Prior to versions 7.0.13 and 8.0.2, working with large buffers in Lua scripts can lead to a stack overflow. Users of Lua rules and output scripts may be affected when working with large buffers. This includes a rule passing a large buffer to a Lua script. This issue has been patched in versions 7.0.13 and 8.0.2. A workaround for this issue involves disabling Lua rules and output scripts, or making sure limits, such as stream.depth.reassembly and HTTP response body limits (response-body-limit), are set to less than half the stack size.
Risk Information
cvss3
Base: 7.5
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. In versions from 8.0.0 to before 8.0.2, a NULL dereference can occur when the entropy keyword is used in conjunction with base64_data. This issue has been patched in version 8.0.2. A workaround involves disabling rules that use entropy in conjunction with base64_data.
Risk Information
cvss3
Base: 7.5
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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RapidWhat Do We Measure ?
Incident
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Network Security
Identify exposed access points, detect misconfigured SSL certificates, and uncover vulnerabilities across the network infrastructure.
SBOM (Software Bill of Materials)
Gain visibility into the software components used within an organization to detect vulnerabilities, manage risk, and ensure supply chain security.
CMDB (Configuration Management Database)
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Leverage real-time insights on active threats, malware campaigns, and emerging vulnerabilities to proactively defend against evolving cyberattacks.
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