Auth bypass in Gvectors Wpforo Forum
CVE-2026-28556
wpForo Forum 2.4.14 contains a missing authorization vulnerability that allows authenticated subscribers to move, merge, or split any forum topic via the topic_move, topic_merge, and topic_split form action handlers. Attackers with a valid form nonce can reorganize arbitrary forum content without moderator permissions, including relocating topics to private forums.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · 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-manag… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-28556?
- CVE-2026-28556 is a medium-severity vulnerability in Gvectors Wpforo Forum, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-02-28.
- How severe is CVE-2026-28556?
- Medium severity. CVSS v3 base score is 5.4 out of 10.