CVE-2026-25511 Group-Office is vulnerable to SSRF and File Read in WOPI service discovery

High 8.2 Published 4 Feb 2026 Updated 5 Feb 2026

Authenticated administrators can exploit SSRF in WOPI discovery to read internal files and exfiltrate data via debug output.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-25511?

CVE-2026-25511 is a high-severity server-side request forgery vulnerability in Intermesh groupoffice, published on 4 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.150, 25.0.82, and 26.0.5, an authenticated user within the System Administrator group can trigger a full SSRF via the WOPI service discovery URL, including access to internal hosts/ports. The SSRF response body can be exfiltrated via the built‑in debug system, turning it into a visible SSRF. This also allows full server-side file read. This issue has been patched in versions 6.8.150, 25.0.82, and 26.0.5.

Weakness: CWE-918

Which versions are affected by CVE-2026-25511?

It affects 1 product.

Products include Group-Office Group Office.

How do I fix CVE-2026-25511?

No fix has been published for CVE-2026-25511 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-25511 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25511 exists.

Sources

Also known as GHSA-r9v4-jm2r-r9pm.