Missing Authorization in Group Office - #VU165864
Published: November 11, 2026
Vulnerability identifier: #VU165864
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to modify installed GroupOffice state without authorization and disrupt availability.
The vulnerability exists due to missing authorization in www/install/upgrade.php when installation-maintenance endpoints remain reachable after installation. A remote attacker can send a request containing confirmed=1 to invoke privileged database upgrade logic, clear caches, disable unavailable modules, and update the stored database version.
Affected software
Group Office
Remediation
Install security update from vendor's website.
Group Office - update to 26.0.58