EUVD-2026-40101
GHSA-j7cj-983v-9p46
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
XSS with subscriber auth (PR:L), admin interaction required (UI:R), scope change to admin browser (S:C); availability impact not substantiated for typical XSS.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Lifecycle Timeline
1DescriptionCVE.org
Subscriber Cross Site Scripting (XSS) in MasterStudy LMS <= 3.7.27 versions.
AnalysisAI
Stored Cross-Site Scripting in the MasterStudy LMS WordPress plugin (versions <= 3.7.27) allows authenticated subscriber-level users to inject malicious scripts that execute in the browsers of higher-privileged users such as administrators. The vulnerability carries a Scope:Changed CVSS vector, meaning successful exploitation breaks the browser security boundary and can impact resources beyond the plugin itself - enabling session hijacking, credential theft, or privilege escalation within the WordPress admin context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a valid subscriber-level (or equivalent low-privilege) authenticated account on the target WordPress site - unauthenticated exploitation is not supported by the PR:L CVSS metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 6.5 (Medium) is broadly appropriate, but several signals refine real-world priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers a free subscriber account on a WordPress-based e-learning platform running MasterStudy LMS <= 3.7.27, then submits a crafted payload - such as a script tag - into a plugin input field (e.g., a course review, profile field, or quiz submission) that is later rendered in the WordPress admin panel. When a site administrator visits the affected page, the injected script executes in their browser, exfiltrating the admin's session cookie or silently creating a new administrator account for persistent access. … |
| Remediation | The primary fix is to update MasterStudy LMS to a version above 3.7.27. … 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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