Auth bypass in Automattic Sensei Lms
CVE-2026-112329
The Sensei LMS WordPress plugin before 4.26.4 contains a broken access control vulnerability in the legacy save_new_message handler hooked on the init action, which validates only a generic nonce without verifying course enrollment or restricting post_id to valid post types. Authenticated attackers, including unprivileged Subscribers, can supply an arbitrary post_id for any course, lesson, or quiz to create a private message addressed to that post's author, bypassing the enrollment checks enforced by the newer REST send-message controller.
Vulnerability class: Broken Access Control
Published · last modified .
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.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- senseilms.com/release-notes/ (release-notes, patch)
- www.vulncheck.com/advisories/sensei-lms-broken-access-control-via-save-new-mess… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112329?
- CVE-2026-112329 is a medium-severity vulnerability in Automattic Sensei Lms, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-19.
- How severe is CVE-2026-112329?
- Medium severity. CVSS v3 base score is 4.3 out of 10.