CVE-2026-28557: Gvectors Wpforo Forum

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

wpForo Forum 2.4.14 contains a missing capability check vulnerability that allows authenticated users to trigger bulk wpForo usergroup reassignment via the wpforo_synch_roles AJAX handler. Attackers access the usergroups admin page, accessible to any authenticated user, to obtain a nonce, then remap all wpForo usergroups to arbitrary WordPress roles.

Affected products

• Gvectors Wpforo Forum: from 2.4.0, before 2.4.16 (fixed in 2.4.16)

Published 2026-02-28. Last modified 2026-06-17.