Masteriyo LMS 1.18.0 - 2.3.3 - Instructor+ Stored XSS via Course Custom Fields
Priority LOW 32CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- 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 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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00431 37th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Masteriyo LMS (Unknown): 3.4.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Masteriyo LMS | 1.18.0 to before 3.4.0 | 3.4.0 | Patch available | CNA |
- Masteriyo LMS VendorUnknown Affected 1.18.0 to before 3.4.0 Fixed in 3.4.0 Patch available CNA
Remediation
- Fix · CNA Masteriyo LMS (Unknown) Fixed in 3.4.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-82846
- 2026-10-03 Alias added: GHSA-q7cm-xchw-5v25
References
Sources
- CVE-2026-82846 · CVE Program
- CVE-2026-82846 · NVD
- FIRST EPSS
- GHSA-q7cm-xchw-5v25 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences