Auth bypass in Cmb2
CVE-2026-80338
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (2.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
- Cmb2
Weakness classification (CWE)
References
- wpscan.com/vulnerability/7402e0b0-54de-42b3-9032-ae225fb4e76a/ (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-80338?
- CVE-2026-80338 is a medium-severity vulnerability in Cmb2, classified under Missing Authorization. CVSS score: 6.8/10. Published 2026-09-24.
- How severe is CVE-2026-80338?
- Medium severity. CVSS v3 base score is 6.8 out of 10.