What’s Vulnerable › Vulnerabilities

CVE-2023-34192: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

• Severity: critical (CVSS 9.0 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-02-25
• EPSS: 77.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-07-06 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.

Affected products

• Zimbra Collaboration: 8.8.15, 8.8.15-p1, 8.8.15-p10, 8.8.15-p11, 8.8.15-p12, 8.8.15-p13 (+35)

References

• https://wiki.zimbra.com/wiki/Security_Center
• https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
• https://wiki.zimbra.com/wiki/Security_Center
• https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-34192

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