Auth bypass in Masteriyo Lms
CVE-2026-82849
The Masteriyo LMS WordPress plugin before 3.4.2 does not verify that the user making the request owns the course-progress records being returned, allowing any authenticated user, such as a self-registered subscriber, to read another user's learning activity. The ownership check it applies is skipped whenever the requested account is not named with a non-zero value, in which case the records of every learner on the site are returned at once.
Vulnerability class: IDOR (Insecure Direct Object Reference)
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:L/I:N/A:N.
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
- Masteriyo Lms
Weakness classification (CWE)
References
- wpscan.com/vulnerability/8114501a-3591-4d8c-b73e-a598756d45d7/ (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-82849?
- CVE-2026-82849 is a medium-severity vulnerability in Masteriyo Lms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-09-24.
- How severe is CVE-2026-82849?
- Medium severity. CVSS v3 base score is 4.3 out of 10.