Quick answers
- Is CVE-2026-81339 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-81339 being exploited in the wild.
- How severe is CVE-2026-81339?
- Medium severity, with a CVSS score of 4.3, published 23 September 2026.
- Which products and versions are affected?
- MasterStudy LMS WordPress Plugin before 3.7.50.
- Is there a fix for CVE-2026-81339?
- A patch was published on 2026-09-23: Fixed in version 3.7.50 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-81339 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-81339?
- Check whether you run MasterStudy LMS WordPress Plugin at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an insecure direct object reference (IDOR) in the quiz attempt results endpoint that lacks per-object ownership validation. An authenticated user with the subscriber role can enumerate quiz attempt IDs and retrieve another user's quiz attempt data including grades, pass/fail status, and attempt timestamps. No network-level attack vector is required beyond normal authenticated access to the WordPress site; the attacker needs only valid login credentials at the subscriber level or above.
Affected products
- MasterStudy LMS WordPress Plugin before 3.7.50
Timeline
- 2026-09-23: disclosed: CVE-2026-81339 published
- 2026-09-23: patched: Fixed in version 3.7.50