GT
Company Details
Linkedin ID:
grant-thornton-us
Website:
Employees number:
11,442
Number of followers:
586,524
NAICS:
5412
Industry Type:
Homepage:
grantthornton.com
IP Addresses:
0
Company ID:
GRA_1064405
Scan Status:
In-progress
Grant Thornton (US) Company CyberSecurity Posture
grantthornton.com
Forget what you think you know about professional services. We go beyond what’s expected and help others do the same. Grant Thornton is the brand name for Grant Thornton LLP and Grant Thornton Advisors LLC the U.S. member firms of Grant Thornton International Ltd, one of the world’s leading independent audit & assurance, tax and advisory firms. That means our network has more than 73,000 professionals in more than 146 countries who are ready to help public and private organizations of all sizes take on today’s challenges. But what sets us apart isn’t just what we do – it’s how we do it. Here, we believe in making business more personal and building trust into every result. We’re collaborators – obsessed with quality and ready for anything – who understand the value of strong relationships. It’s how we challenge the expectations of business and empower our people and clients to do it, too. One thing we won’t do? Grant Thornton will never request money or any form of payment for services via social media. Please report any concerns at 1-800-810-3503. Grant Thornton International Limited (GTIL) and the member firms, including Grant Thornton LLP and Grant Thornton Advisors LLC, are not a worldwide partnership. Services are delivered by the member firms. GTIL and its member firms are not agents of, and do not obligate, one another and are not liable for one another’s acts or omissions. Please see www.grantthornton.com for further details.
Grant Thornton (US) A.I CyberSecurity Scoring
GT Risk Score (AI oriented)Between 750 and 799
GT
Updated:
- Powered by our proprietary A.I cyber incident model
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GT Global Score (TPRM)XXXX
GT
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- Benchmark vs. industry & size peers
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GT Company CyberSecurity News & History
Past Incidents
1
Attack Types
1
Grant Thornton LLP
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 Grant Thornton LLP on September 19, 2023. The breach occurred between April 19, 2023, and May 1, 2023, due to unauthorized access to an employee's email account, potentially affecting an unknown number of individuals, with names and additional unspecified personal information being involved.
GT 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 GT
Incidents vs Accounting Industry Average (This Year)
No incidents recorded for Grant Thornton (US) in 2025.
Incidents vs All-Companies Average (This Year)
No incidents recorded for Grant Thornton (US) in 2025.
Incident Types GT vs Accounting Industry Avg (This Year)
No incidents recorded for Grant Thornton (US) in 2025.
Incident History — GT (X = Date, Y = Severity)
GT cyber incidents detection timeline including parent company and subsidiaries
GT Company Subsidiaries
Forget what you think you know about professional services. We go beyond what’s expected and help others do the same. Grant Thornton is the brand name for Grant Thornton LLP and Grant Thornton Advisors LLC the U.S. member firms of Grant Thornton International Ltd, one of the world’s leading independent audit & assurance, tax and advisory firms. That means our network has more than 73,000 professionals in more than 146 countries who are ready to help public and private organizations of all sizes take on today’s challenges. But what sets us apart isn’t just what we do – it’s how we do it. Here, we believe in making business more personal and building trust into every result. We’re collaborators – obsessed with quality and ready for anything – who understand the value of strong relationships. It’s how we challenge the expectations of business and empower our people and clients to do it, too. One thing we won’t do? Grant Thornton will never request money or any form of payment for services via social media. Please report any concerns at 1-800-810-3503. Grant Thornton International Limited (GTIL) and the member firms, including Grant Thornton LLP and Grant Thornton Advisors LLC, are not a worldwide partnership. Services are delivered by the member firms. GTIL and its member firms are not agents of, and do not obligate, one another and are not liable for one another’s acts or omissions. Please see www.grantthornton.com for further details.
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GT CyberSecurity News
November 26, 2025 12:44 AM
From mountains to monitors: Defending our natural and digital world
In the heart of Luzon stands the Sierra Madre, the longest mountain range in the Philippines. Admired not only for its breathtaking beauty...
November 20, 2025 05:00 PM
Securing innovation: AI, cybersecurity & supply chain resilience in life sciences
November 20, 2025 — This panel discussion brings together visionary leaders who are driving change at the intersection of science,...
November 07, 2025 08:00 AM
Grant Thornton appoints four partners across advisory and audit
Grant Thornton has announced the appointments of Tom Kelly, Zoë Sheehan-Kohli, Howard Shortt, and Ian Wilson as new partners across its...
November 05, 2025 08:00 AM
Redefining leadership and resilience in cybersecurity
ARTIFICIAL intelligence (AI) has deeply woven itself into our everyday lives, from education to business to national security.
October 29, 2025 07:00 AM
Thriving through disruption
In a global environment defined by volatility, uncertainty, and constant change, Salles Sainz Grant Thornton shares key insights from the...
October 09, 2025 07:00 AM
SMU Lands $2.7M Federal Grant to Test Autonomous Systems Against ‘New Class’ of Cyber Threats
Southern Methodist University has landed a $2.7 million federal grant to lead research aimed at identifying cyber vulnerabilities in...
October 08, 2025 07:00 AM
Grant Thornton releases part three of its Digital Transformation survey
The final of three reports from Grant Thornton's Digital Transformation survey — which gathered insights from more than 550 cross-functional...
October 03, 2025 07:00 AM
Grant Thornton US adds France, Spain, and Belgium member firms
Grant Thornton US has continued its private equity-backed expansion with the acquisition of the Grant Thornton member firms for France,...
September 10, 2025 07:00 AM
Strengthening Incident Response Amid Rising Geopolitical Threats
In today's volatile geopolitical climate, cyber threats have evolved into a critical dimension of modern conflict.
Frequently Asked Questions
Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
GT CyberSecurity History Information
Official Website of Grant Thornton (US)
The official website of Grant Thornton (US) is https://gt-us.co/3LukwpC.
Grant Thornton (US)’s AI-Generated Cybersecurity Score
According to Rankiteo, Grant Thornton (US)’s AI-generated cybersecurity score is 759, reflecting their Fair security posture.
How many security badges does Grant Thornton (US)’ have ?
According to Rankiteo, Grant Thornton (US) currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
Does Grant Thornton (US) have SOC 2 Type 1 certification ?
According to Rankiteo, Grant Thornton (US) is not certified under SOC 2 Type 1.
Does Grant Thornton (US) have SOC 2 Type 2 certification ?
According to Rankiteo, Grant Thornton (US) does not hold a SOC 2 Type 2 certification.
Does Grant Thornton (US) comply with GDPR ?
According to Rankiteo, Grant Thornton (US) is not listed as GDPR compliant.
Does Grant Thornton (US) have PCI DSS certification ?
According to Rankiteo, Grant Thornton (US) does not currently maintain PCI DSS compliance.
Does Grant Thornton (US) comply with HIPAA ?
According to Rankiteo, Grant Thornton (US) is not compliant with HIPAA regulations.
Does Grant Thornton (US) have ISO 27001 certification ?
According to Rankiteo,Grant Thornton (US) is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Industry Classification of Grant Thornton (US)
Grant Thornton (US) operates primarily in the Accounting industry.
Number of Employees at Grant Thornton (US)
Grant Thornton (US) employs approximately 11,442 people worldwide.
Subsidiaries Owned by Grant Thornton (US)
Grant Thornton (US) presently has no subsidiaries across any sectors.
Grant Thornton (US)’s LinkedIn Followers
Grant Thornton (US)’s official LinkedIn profile has approximately 586,524 followers.
NAICS Classification of Grant Thornton (US)
Grant Thornton (US) is classified under the NAICS code 5412, which corresponds to Accounting, Tax Preparation, Bookkeeping, and Payroll Services.
Grant Thornton (US)’s Presence on Crunchbase
No, Grant Thornton (US) does not have a profile on Crunchbase.
Grant Thornton (US)’s Presence on LinkedIn
Yes, Grant Thornton (US) maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/grant-thornton-us.
Cybersecurity Incidents Involving Grant Thornton (US)
As of November 27, 2025, Rankiteo reports that Grant Thornton (US) has experienced 1 cybersecurity incidents.
Number of Peer and Competitor Companies
Grant Thornton (US) has an estimated 9,603 peer or competitor companies worldwide.
What types of cybersecurity incidents have occurred at Grant Thornton (US) ?
Incident Types: The types of cybersecurity incidents that have occurred include Breach.
Incident Details
Can you provide details on each incident ?
Title: Grant Thornton LLP Data Breach
Description: Unauthorized access to an employee's email account, potentially affecting an unknown number of individuals, with names and additional unspecified personal information being involved.
Date Detected: 2023-09-19
Date Publicly Disclosed: 2023-09-19
Type: Data Breach
Attack Vector: Email Account Compromise
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 GRA519072625
Data Compromised: Names, Unspecified personal 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 Names, Unspecified Personal Information and .
Which entities were affected by each incident ?
Incident : Data Breach GRA519072625
Entity Name: Grant Thornton LLP
Entity Type: Organization
Industry: Professional Services
Data Breach Information
What type of data was compromised in each breach ?
Incident : Data Breach GRA519072625
Type of Data Compromised: Names, Unspecified personal information
References
Where can I find more information about each incident ?
Incident : Data Breach GRA519072625
Source: California Office of the Attorney General
Date Accessed: 2023-09-19
Where can stakeholders find additional resources on cybersecurity best practices ?
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: California Office of the Attorney GeneralDate Accessed: 2023-09-19.
Additional Questions
Incident Details
What was the most recent incident detected ?
Most Recent Incident Detected: The most recent incident detected was on 2023-09-19.
What was the most recent incident publicly disclosed ?
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2023-09-19.
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 Names, Unspecified Personal Information and .
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 Unspecified Personal Information and Names.
References
What is the most recent source of information about an incident ?
Most Recent Source: The most recent source of information about an incident is California Office of the Attorney General.
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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
Finding
Grade
Digital Assets
Every week, Rankiteo analyzes billions of signals to give organizations a sharper, faster view of emerging risks. With deeper, more actionable intelligence at their fingertips, security teams can outpace threat actors, respond instantly to Zero-Day attacks, and dramatically shrink their risk exposure window.
These are some of the factors we use to calculate the overall score:
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)
Monitor and manage all IT assets and their configurations to ensure accurate, real-time visibility across the company's technology environment.
Threat Intelligence
Leverage real-time insights on active threats, malware campaigns, and emerging vulnerabilities to proactively defend against evolving cyberattacks.
Rankiteo is a unified scoring and risk platform that analyzes billions of signals weekly to help organizations gain faster, more actionable insights into emerging threats. Empowering teams to outpace adversaries and reduce exposure.
