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TI-2026-56157 Aliases CVE-2026-81339GHSA-fj8j-x93w-h29w

MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR

Priority LOW 20CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-639.

Summary

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not perform a per-object ownership check when returning a quiz attempt result, allowing any authenticated user with a minimal (subscriber) role to read other students' quiz grades, pass/fail status and attempt timestamps by referencing an attempt identifier belonging to another user.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0027 19th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed MasterStudy LMS WordPress Plugin (Unknown): 3.7.50

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownMasterStudy LMS WordPress Pluginbefore 3.7.503.7.50Patch availableCNA
  • MasterStudy LMS WordPress Plugin VendorUnknown Affected before 3.7.50 Fixed in 3.7.50 Patch available CNA

Remediation

  • Fix · CNA MasterStudy LMS WordPress Plugin (Unknown) Fixed in 3.7.50

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    MasterStudy LMS WordPress Plugin 3.7.50

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-56156 MasterStudy LMS < 3.7.50 - Subscriber+ Stored HTML Injection via Course DiscussionsPriority LOW 20
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-81339
  2. 2026-10-03 Alias added: GHSA-fj8j-x93w-h29w

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences