Cross-site scripting in Group Office - #VU164348
Published: November 10, 2026
Vulnerability identifier: #VU164348
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary JavaScript in a victim's Group Office session, potentially take over their account, and destroy global synchronization state.
The vulnerability exists due to unvalidated static-method dispatch and improper output neutralization in the site module's actionAjaxWidget() when handling unauthenticated requests containing class and method names. A remote attacker can lure a logged-in victim to a crafted URL to execute reflected JavaScript or directly invoke public static methods accepting a single request array to delete synchronization state.
Affected software
Group Office
Remediation
Install security update from vendor's website.
Group Office - addressed in versions 6.8.180, 25.0.115, 26.0.57