Stored cross-site scripting in Zimbra Collaboration - CVE-2025-27915
Published: October 6, 2025
Vulnerability identifier: #VU116623
CSH Severity: High
CVSS v4: 6.4 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N]
CVE-ID: CVE-2025-27915
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data when handling ICS files. A remote attacker can send an email message with a specially crafted calendar attachment and execute arbitrary JavaScript code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Note, the vulnerability is being actively exploited in the wild.
Affected software
Zimbra Collaboration
How to mitigate CVE-2025-27915
Install updates from vendor's website.
Zimbra Collaboration - addressed in versions 9.0.0 Patch 46, 10.0.15, 10.1.9