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TI-2026-15991 Aliases CVE-2026-19712GHSA-9qrh-j6xc-w4qf

Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

The Masteriyo LMS WordPress plugin before 2.3.3 does not sanitise and escape a quiz field before outputting it back in a page, and grants its instructor role the ability to store unfiltered HTML, allowing such users to perform Stored Cross-Site Scripting attacks against any visitor of the affected page, including administrators. This affects default single-site installations. Sites running multisite, or defining DISALLOW_UNFILTERED_HTML, are not affected as the capability is not granted there.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00253 16th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Masteriyo LMS (Unknown): 2.3.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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
UnknownMasteriyo LMSbefore 2.3.32.3.3Patch availableCNA
  • Masteriyo LMS VendorUnknown Affected before 2.3.3 Fixed in 2.3.3 Patch available CNA

Remediation

  • Fix · CNA Masteriyo LMS (Unknown) Fixed in 2.3.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-19712
  2. 2026-10-03 Alias added: GHSA-9qrh-j6xc-w4qf

References

Exploit 1

Sources

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