Medium severity · published Aug 16, 2026
CVE-2026-19712
Masteriyo LMS < 2.3.3 - Instructor+ Stored XSS via Quiz Description
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ML
Masteriyo LMS ·
before 2.3.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19712
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-19712
wpscan.com
https://wpscan.com/vulnerability/08c31101-ee38-46e9-b451-abb1ed70079c/
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