What’s Vulnerable › Vulnerabilities

CVE-2023-37580: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2023-07-27
• EPSS: 49.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-07-31 · updated 2026-06-17
• Weakness: CWE-79

Description

Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.

Affected products

• Zimbra Collaboration: from 8.8.0 before 8.8.15; 8.8.15-p11, 8.8.15-p26, 8.8.15-p3, 8.8.15-p30, 8.8.15-p31, 8.8.15-p32 (+7) — fixed in 8.8.15

How to fix

Upgrade to a fixed version: Zimbra Collaboration 8.8.15. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2023/11/17/2
• https://wiki.zimbra.com/wiki/Security_Center
• https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
• http://www.openwall.com/lists/oss-security/2023/11/17/2
• https://wiki.zimbra.com/wiki/Security_Center
• https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-37580

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