CVE Watch—

CVE-2023-34192

Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

CVSS

—

No CVSS

EPSS

77.3%

p100

KEV

YES

Feb 25, 2025

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

77.3%EPSS · 30 days77.3%

2026-09-172026-10-15

KEV catalog record

Product

Synacor / Zimbra Collaboration Suite (ZCS)

Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

Added to KEV

Feb 25, 2025

Remediate by

Mar 18, 2025

Known ransomware use

Summary description

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability that allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2023-34192

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