CVE-2026-33755: Authenticated SQL Injection in Contact/query addressBookIds filter
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33755?
CVE-2026-33755 is classified as a high severity authenticated SQL injection vulnerability.
How do I fix CVE-2026-33755?
To fix CVE-2026-33755, update to Group-Office versions 6.8.158, 25.0.92, or 26.0.17 or later.
Who is affected by CVE-2026-33755?
CVE-2026-33755 affects all versions of Group-Office prior to 6.8.158, 25.0.92, and 26.0.17.
What types of attacks can exploit CVE-2026-33755?
CVE-2026-33755 can be exploited to execute unauthorized SQL commands, potentially allowing attackers to access sensitive data.
Is user authentication required to exploit CVE-2026-33755?
Yes, exploiting CVE-2026-33755 requires user authentication to access the vulnerable JMAP 'Contact/query' endpoint.