EUVD-2026-76788
GHSA-8hqp-p78r-mqpg
Severity by source
AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
S:C applied because stored XSS crosses from instructor's trust level into the admin's browser session, a distinct security scope.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
Lifecycle Timeline
5DescriptionCVE.org
The Masteriyo LMS WordPress plugin before 3.4.1 does not sanitise and escape one of its course fields before outputting it back in the course editor, allowing users with the instructor role to perform Stored Cross-Site Scripting attacks against higher privileged users such as administrators.
AnalysisAI
Stored Cross-Site Scripting in the Masteriyo LMS WordPress plugin (versions before 3.4.1) allows authenticated users with the instructor role to inject persistent malicious scripts into course editor fields, targeting higher-privileged users such as site administrators. When an admin opens the affected course in the editor, the stored payload executes in their browser context, enabling session hijacking and full administrative account takeover. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid WordPress account with the instructor role on the target site - this is a deliberate role that site owners grant, so the attack surface depends entirely on how freely instructor registrations are permitted. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H) scores at 6.8 but warrants independent scrutiny: S:U (Unchanged scope) is inconsistent with a stored XSS that crosses a privilege boundary from instructor to admin - most NVD scorers apply S:C in this pattern, which would raise the effective score toward 8.0+. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Update the Masteriyo LMS plugin to version 3.4.1 or later; this is a vendor-released patch that resolves the missing sanitization and output escaping. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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