Incident Score: Analysis & Impact (ZIM1770993314)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Zimbra's Vulnerability and lateral movement inside company's environment.
- Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
- How Rankiteo’s incident engine converts technical details into a normalized incident score.
- How this cyber incident impacts Zimbra Rankiteo cyber scoring and cyber rating.
- Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.
Full Incident Analysis Transcript
In this Rankiteo incident briefing, we review the Zimbra breach identified under incident ID ZIM1770993314.
The analysis begins with a detailed overview of Zimbra's information like the linkedin page: https://www.linkedin.com/company/zimbra, the number of followers: 15746, the industry type: Software Development and the number of employees: 118 employees
After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 722 and after the incident was 717 with a difference of -5 which is could be a good indicator of the severity and impact of the incident.
In the next step of the video, we will analyze in more details the incident and the impact it had on Zimbra and their customers.
Zimbra Collaboration Suite Users recently reported "Zimbra Releases Critical Security Update to Patch High-Severity Vulnerabilities", a noteworthy cybersecurity incident.
Zimbra has issued version 10.1.16, a critical security update addressing multiple high-severity vulnerabilities in its collaboration suite that could expose email infrastructure and user data to web-based attacks.
The disruption is felt across the environment, affecting Zimbra Webmail, Briefcase and EWS SOAP endpoint, and exposing User data, Directory data and Internal files.
In response, moved swiftly to contain the threat with measures like Patch release (version 10.1.16), Enhanced input validation and Improved sanitization, and began remediation that includes Security update deployment and Backup recommendation before upgrade.
The case underscores how and recommending next steps like Organizations running vulnerable versions are advised to apply the patch immediately to secure their email ecosystems.
Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.
The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.
MITRE ATT&CK® Correlation Analysis
Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Exploit Public-Facing Application (T1190) with high confidence (90%), with evidence including high-severity vulnerabilities in its collaboration suite, and web-based attacks and Drive-by Compromise (T1189) with moderate to high confidence (70%), supported by evidence indicating cross-Site Scripting (XSS) vulnerability in Zimbra Webmail. Under the Execution tactic, the analysis identified Exploitation for Client Execution (T1203) with moderate to high confidence (80%), supported by evidence indicating inject malicious scripts into user sessions via XSS. Under the Persistence tactic, the analysis identified Browser Session Hijacking (T1185) with moderate to high confidence (70%), supported by evidence indicating session hijacking via XSS in Webmail/Briefcase. Under the Privilege Escalation tactic, the analysis identified Exploitation for Privilege Escalation (T1068) with moderate confidence (60%), supported by evidence indicating authenticated LDAP injection flaw enabling unauthorized access. Under the Credential Access tactic, the analysis identified Brute Force: Password Guessing (T1110.001) with moderate confidence (50%), supported by evidence indicating lDAP injection could manipulate queries for unauthorized access. Under the Discovery tactic, the analysis identified Data from Information Repositories (T1213) with moderate to high confidence (70%), supported by evidence indicating xXE in EWS SOAP endpoint could disclose internal files and Account Discovery: Domain Account (T1087.002) with moderate confidence (60%), supported by evidence indicating lDAP injection enabling manipulation of directory data. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating xXE could disclose internal files, user data compromised. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating vulnerabilities could enable data exfiltration and Exfiltration Over Other Network Medium: Email (T1011.001) with moderate confidence (60%), supported by evidence indicating zimbra email infrastructure exposed to web-based attacks. Under the Defense Evasion tactic, the analysis identified Valid Accounts: Default Accounts (T1078.001) with moderate confidence (50%), supported by evidence indicating authenticated LDAP injection flaw and Rogue Domain Controller (T1207) with lower confidence (40%), supported by evidence indicating lDAP query manipulation could impersonate directory services. Under the Lateral Movement tactic, the analysis identified Exploitation of Remote Services (T1210) with moderate confidence (60%), supported by evidence indicating xXE in EWS SOAP endpoint enabling SSRF or deeper compromise. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Zimbra Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/zimbra/incident/ZIM1770993314
- Zimbra CyberSecurity Rating page: https://www.rankiteo.com/company/zimbra
- Zimbra Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/zim1770993314-zimbra-vulnerability-february-2026/
- Zimbra CyberSecurity Score History: https://www.rankiteo.com/company/zimbra/history
- Zimbra CyberSecurity Incident Source: https://cyberpress.org/zimbra-vulnerabilities/
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf