CVE-2026-5144 BuddyPress Groupblog <= 1.9.3 - Authenticated (Subscriber+) Privilege Escalation to Administrator via Group Blog IDOR

What is CVE-2026-5144?

CVE-2026-5144 is a high-severity vulnerability in boonebgorges BuddyPress Groupblog, published on 11 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The BuddyPress Groupblog plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.9.3. This is due to the group blog settings handler accepting the `groupblog-blogid`, `default-member`, and `groupblog-silent-add` parameters from user input without proper authorization checks. The `groupblog-blogid` parameter allows any group admin (including Subscribers who create their own group) to associate their group with any blog on the Multisite network, including the main site (blog ID 1). The `default-member` parameter accepts any WordPress role, including `administrator`, without validation against a whitelist. When combined with `groupblog-silent-add`, any user who joins the attacker's group is automatically added to the targeted blog with the injected role. This makes it possible for authenticated attackers, with Subscriber-level access and above, to escalate any user (including themselves via a second account) to Administrator on the main site of the Multisite network.

Weakness: CWE-269

Which versions are affected by CVE-2026-5144?

How do I fix CVE-2026-5144?

No fix has been published for CVE-2026-5144 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-5144 being exploited?

There is no known exploitation of CVE-2026-5144 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mxm6-xwqw-p92f.