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.

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

EPSS: 0.003 (18.8th percentile) — read the EPSS interpretation.

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.

Affected products

Gvectors Wpforo_forum
Gvectors Team Wpforo Forum — versions 2.4, 2.4.16

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (Release Notes, patch)
disclosure@vulncheck.com (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.