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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.

PUBLISHED Reserved 2026-02-28 | Published 2026-02-28 | Updated 2026-02-28 | Assigner VulnCheck




HIGH: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Problem types

Missing Authorization

Product status

Default status
unaffected

2.4 (semver) before 2.4.16
affected

2.4.16 (semver)
unaffected

Credits

Scott Moore - VulnCheck finder

References

wordpress.org/plugins/wpforo/ (wpForo Forum WordPress Plugin) product

wordpress.org/plugins/wpforo/ (wpForo Forum Contributors & Developers) patch

www.vulncheck.com/...lation-via-role-synchronization-handler (VulnCheck Advisory: wpForo Forum 2.4.14 Privilege Escalation via Role Synchronization Handler) third-party-advisory

cve.org (CVE-2026-28557)

nvd.nist.gov (CVE-2026-28557)

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