CVE-2026-28557 wpForo Forum < 2.4.16 Privilege Escalation via Role Synchronization Handler
Authenticated users can escalate privileges by remapping wpForo usergroups to arbitrary WordPress roles via a missing capability check.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-28557?
CVE-2026-28557 is a high-severity vulnerability in gVectors Team wpForo Forum, published on 28 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-28557?
It affects 1 product.
Products include Gvectors Wpforo Forum.
How do I fix CVE-2026-28557?
No fix has been published for CVE-2026-28557 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-28557 being exploited?
There is no known exploitation of CVE-2026-28557 in the wild and no public exploit code.
Other vulnerabilities in gVectors Team wpForo Forum
- CVE-2024-3200 wpForo Forum <= 2.3.3 - Authenticated (Contributor+) SQL Injection
- CVE-2022-40200 WordPress wpForo Forum plugin <= 2.0.9 - Auth. Arbitrary File Upload vulnerability
- CVE-2018-16613 Privilege escalation in n/a
- CVE-2026-28562 wpForo Forum 2.4.14 SQL Injection via Topics ORDER BY Parameter
- CVE-2023-2249 Server-side request forgery in wpForo Forum
Sources
Also known as GHSA-gfm6-fcx7-chmc.