CVE-2026-28555 | THREATINT

Description

wpForo Forum 2.4.14 contains a missing authorization vulnerability that allows authenticated subscribers to close or reopen any forum topic via the wpforo_close_ajax handler. Attackers submit a valid nonce with an arbitrary topic ID to bypass the moderator permission requirement and disrupt forum discussions.

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

MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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/...horization-via-topic-close-ajax-handler (VulnCheck Advisory: wpForo Forum 2.4.14 Missing Authorization via Topic Close AJAX Handler) third-party-advisory

cve.org (CVE-2026-28555)

nvd.nist.gov (CVE-2026-28555)

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