CVE-2026-25511

Name of the Vulnerable Software and Affected Versions Group-Office versions prior to 6.8.150 Group-Office versions prior to 25.0.82 Group-Office versions prior to 26.0.5

Description An authenticated user with System Administrator privileges can trigger a server-side request forgery (SSRF) through the WOPI service discovery URL. This allows access to internal hosts and ports, and the response body can be exfiltrated using the built-in debug system, resulting in a visible SSRF and enabling full server-side file read.

Recommendations Update Group-Office to version 6.8.150 or later. Update Group-Office to version 25.0.82 or later. Update Group-Office to version 26.0.5 or later.