EUVD-2026-39375
GHSA-rp27-rcxx-mqmc
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Unauthenticated network-reachable reflected XSS (PR:N, AV:N, AC:L) requires a victim click (UI:R); execution in the browser session crosses a security boundary (S:C) with limited C/I/A impact.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Lifecycle Timeline
1DescriptionCVE.org
Unauthenticated Cross Site Scripting (XSS) in H5P <= 1.17.6 versions.
AnalysisAI
Reflected cross-site scripting in the H5P WordPress plugin (versions 1.17.6 and earlier) lets an unauthenticated attacker inject script that executes in a victim's browser when they follow a crafted link, per the CVSS PR:N/UI:R vector. Because the scope is changed (S:C), successful execution can reach beyond the vulnerable component into the authenticated WordPress session context, enabling session/cookie theft or admin-context actions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires no authentication (PR:N) but does require user interaction (UI:R): a victim - ideally an authenticated WordPress user/administrator - must click or load an attacker-crafted link/request that carries the reflected payload to a site running H5P plugin version 1.17.6 or earlier. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.1 (High) with vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L: network-reachable, low complexity, no privileges, but requiring user interaction, with a scope change and low confidentiality/integrity/availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a URL to a vulnerable H5P endpoint containing a malicious script payload in a reflected parameter and sends it to a logged-in WordPress administrator via phishing or a malicious link. When the admin opens the link, the script executes in their authenticated browser session, allowing theft of session cookies or forced administrative actions. … |
| Remediation | No vendor-released patch version was identified in the available data; the input confirms only that versions up to and including 1.17.6 are affected, so administrators should consult the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/h5p/vulnerability/wordpress-h5p-plugin-1-17-6-reflected-cross-site-scripting-xss-vulnerability) and the WordPress plugin repository for any release newer than 1.17.6 and upgrade to it once confirmed. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
WITHIN 24 HOURS: Audit all WordPress installations to identify those running H5P plugin version 1.17.6 or earlier; document counts and affected sites. …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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