CVE-2026-80338 CMB2 < 2.13.0 - Subscriber+ Arbitrary Option Corruption via oEmbed Handler
Subscribers can corrupt WordPress options via an unauthenticated AJAX action in CMB2, potentially breaking site settings and causing denial of service.
- 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-2026-80338?
CVE-2026-80338 is a medium-severity missing authorization vulnerability in Unknown CMB2, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The CMB2 WordPress plugin before 2.13.0 does not perform any capability check on one of its AJAX actions, allowing users with a role as low as Subscriber to create arbitrary WordPress options and corrupt existing ones, which can break core site settings and take the site offline. Exploitation requires the site's or another CMB2 WordPress plugin before 2.13.0 to have declared an oEmbed field, as the CMB2 WordPress plugin before 2.13.0 registers none of its own. The stored value is never attacker-controlled, so the issue does not lead to privilege escalation.
Weakness: CWE-862
Which versions are affected by CVE-2026-80338?
How do I fix CVE-2026-80338?
No fix has been published for CVE-2026-80338 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-80338 being exploited?
There is no known exploitation of CVE-2026-80338 in the wild and no public exploit code.
Sources
Also known as GHSA-vf5h-xv4f-wc7g.