Arbitrary file upload in Group Office - CVE-2026-25134
Published: April 24, 2026
Vulnerability identifier: #VU127526
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-25134
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to insufficient validation of file during file upload within Zip Extraction in the EmailTemplate module. A remote user can upload a malicious file and execute it on the server.
Affected software
Group Office
How to mitigate CVE-2026-25134
Install updates from vendor's website.
Group Office - addressed in versions 6.8.150, 25.0.82, 26.0.5