Server-Side Request Forgery (SSRF) in Group Office - CVE-2026-25511
Published: April 24, 2026 / Updated: April 24, 2026
Vulnerability identifier: #VU127527
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-25511
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The disclosed vulnerability allows a remote user to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input within the WOPI service discovery URL. A remote administrator can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.
Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.
Affected software
Group Office
How to mitigate CVE-2026-25511
Install updates from vendor's website.
Group Office - addressed in versions 6.8.150, 25.0.82, 26.0.5