Key Vulnerability Information Advisory: wpForo Forum 2.4.14 Privilege Escalation via Role Synchronization Handler Severity: MEDIUM Date: 2/28/2026 CVE-ID: CVE-2026-28557 CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VL:H/VA:N/SC:N/SI:N/SA:N Affected Software: wpForo Forum <= 2.4, 2.4.16 References: - wpForo Forum WordPress Plugin - wpForo Forum Contributors & Developers Credit: Scott Moore - VulnCheck Description: - 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.