Auth bypass in Gvectors Wpforo Forum
CVE-2026-28555
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Gvectors Wpforo Forum
- Gvectors Team Wpforo Forum — versions 2.4, 2.4.16
Weakness classification (CWE)
References
- wordpress.org/plugins/wpforo/ (Product, product)
- wordpress.org/plugins/wpforo/ (Release Notes, patch)
- www.vulncheck.com/advisories/wpforo-forum-missing-authorization-via-topic-close… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-28555?
- CVE-2026-28555 is a medium-severity vulnerability in Gvectors Wpforo Forum, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-02-28.
- How severe is CVE-2026-28555?
- Medium severity. CVSS v3 base score is 4.3 out of 10.