EUVD-2026-49664
GHSA-frq5-3q8h-cgc3
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Unauthenticated reflected XSS with no privileges and user interaction required; scope changes as script runs in victim's browser.
Primary rating from Vendor (patchstack).
CVSS VectorVendor: patchstack
Lifecycle Timeline
2DescriptionCVE.org
Unauthenticated Cross Site Scripting (XSS) in Message Filter for Contact Form 7 <= 1.6.3.9 versions.
AnalysisAI
Reflected cross-site scripting in the Message Filter for Contact Form 7 WordPress plugin ≤1.6.3.9 allows unauthenticated attackers to inject arbitrary web scripts via a crafted link. A victim clicking the link executes the script in the context of the vulnerable site, potentially leading to cookie theft, defacement, or other client-side attacks. No public exploit or active exploitation is confirmed, though a vendor advisory addresses the issue.
Technical ContextAI
The vulnerability is a classic Cross-Site Scripting (CWE-79) flaw in the 'cf7-message-filter' WordPress plugin, which extends Contact Form 7. The plugin's message filtering functionality insufficiently sanitizes user-supplied input before reflecting it in a browser, enabling script injection. The vulnerability affects all versions up to and including 1.6.3.9. No specific CPE is provided, but the software is identifiable via the WordPress plugin repository slug 'cf7-message-filter'.
RemediationAI
Update the plugin to version 1.6.3.10 or higher as per the Patchstack advisory. If immediate patching is not feasible, consider temporarily disabling the plugin to eliminate the attack surface; this will disable any message filtering functionality for Contact Form 7 forms. No vendor-provided workaround exists, but a web application firewall (WAF) rule to block reflected XSS patterns can reduce risk until the update is applied. Administrators should also educate users against clicking untrusted links.
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External POC / Exploit Code
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