EUVD-2026-75935
GHSA-9f7m-65q5-q8hw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Changed UI:N to UI:R because payload execution requires an admin to visit the login log; scope change retained since XSS fires in a different user's browser session.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Vigilant - 100% Free Security Suite: Firewall, 2FA, Login, Headers, Scanner… plugin for WordPress is vulnerable to Stored Cross-Site Scripting via User-Agent Header in all versions up to, and including, 2.10.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The malicious payload is delivered passively by any unauthenticated visitor who triggers a failed login attempt with a crafted User-Agent header, requiring no further interaction from the attacker once stored.
AnalysisAI
Stored cross-site scripting in the Vigilant WordPress security plugin (all versions ≤2.10.2) lets an unauthenticated attacker permanently inject malicious scripts by supplying a crafted User-Agent header during any failed login attempt, after which the payload persists in the plugin's login-security log. The script executes automatically in the browser of any administrator who subsequently reviews the login events dashboard, enabling session hijacking or administrative account takeover without further attacker involvement. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication is required to deliver the payload - any unauthenticated HTTP request to the WordPress login endpoint with a crafted User-Agent header is sufficient to store the malicious script. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.2 base score reflects the scope change (S:C) that occurs when attacker-controlled JavaScript executes in an authenticated administrator's browser session, and the unauthenticated, network-accessible delivery path (AV:N/AC:L/PR:N). … 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 Vigilant plugin to a version beyond 2.10.2 immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Deactivate the Vigilant plugin immediately; if operational requirements prevent full disablement, restrict login-log dashboard access by IP whitelist and deploy WAF rules to block User-Agent headers containing XSS payloads (e.g., script tags, onerror, onload, javascript: protocol). …
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External POC / Exploit Code
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