Medium severity · published Sep 5, 2026
CVE-2026-82846
Masteriyo LMS 1.18.0 - 2.3.3 - Instructor+ Stored XSS via Course Custom Fields
6.8
CVSS
0.4%
EPSS
No
On KEV
Description
The Masteriyo LMS WordPress plugin before 3.4.0 does not sanitise and escape some course settings before outputting them in a page available to all visitors, allowing users with a course-author role to perform Stored Cross-Site Scripting attacks that run in the session of anyone viewing the course, including a logged-in administrator.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ML
Masteriyo LMS ·
1.18.0 before 3.4.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82846
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-82846
wpscan.com
https://wpscan.com/vulnerability/0ee2052c-90a8-4b98-947a-adc55feb1de7/
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