CVE-2026-33755 Authenticated SQL Injection in Contact/query addressBookIds filter

High 8.8 Published 27 Mar 2026 Updated 27 Mar 2026

Authenticated users can exploit SQL injection in the JMAP Contact/query endpoint to extract session tokens and take over any user account, including administrators.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-33755?

CVE-2026-33755 is a high-severity SQL injection vulnerability in Intermesh groupoffice, published on 27 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.158, 25.0.92, and 26.0.17, an authenticated SQL Injection vulnerability in the JMAP `Contact/query` endpoint allows any authenticated user with basic addressbook access to extract arbitrary data from the database — including active session tokens of other users. This enables full account takeover of any user, including the System Administrator, without knowing their password. Versions 6.8.158, 25.0.92, and 26.0.17 fix the issue.

Weakness: CWE-89

Which versions are affected by CVE-2026-33755?

It affects 1 product.

Products include Intermesh Group-Office.

How do I fix CVE-2026-33755?

No fix has been published for CVE-2026-33755 yet. Limit exposure of the affected software until one is available.

Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.

Is CVE-2026-33755 being exploited?

There is no known exploitation of CVE-2026-33755 in the wild and no public exploit code.

Sources

Also known as GHSA-3gc4-5993-c2qc.