CVE-2026-30238 Group-Office: Reflected XSS in JavaScript context

Medium 5.1 Published 6 Mar 2026 Updated 9 Mar 2026

Attackers can execute arbitrary JavaScript in victims' browsers via reflected XSS in Group-Office, potentially leading to session hijacking or data theft.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-30238?

CVE-2026-30238 is a medium-severity cross-site scripting vulnerability in Intermesh groupoffice, published on 6 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.155, 25.0.88, and 26.0.10, there is a reflected XSS vulnerability in GroupOffice on the external/index flow. The f parameter (Base64 JSON) is decoded and then injected into an inline JavaScript block without strict escaping, allowing </script><script>...</script> injection and arbitrary JavaScript execution in the victim's browser. This issue has been patched in versions 6.8.155, 25.0.88, and 26.0.10.

Weakness: CWE-79

Which versions are affected by CVE-2026-30238?

It affects 1 product.

Products include Intermesh Group-Office.

How do I fix CVE-2026-30238?

No fix has been published for CVE-2026-30238 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-30238 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30238 exists.

Sources

Also known as GHSA-7p2f-c33m-rv5v.