CVE-2026-66664
Received Received - Intake

Unauthenticated XSS in Squirrly SEO Plugin

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: Patchstack

Description
Unauthenticated Cross Site Scripting (XSS) in SEO Plugin by Squirrly SEO <= 14.2.0 versions.

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Meta Information

Published
2026-08-06
Last Modified
2026-08-06
Generated
2026-08-06
AI Q&A
2026-08-06
EPSS Evaluated
N/A
NVD
CVE-2026-66664
EUVD
EUVD-2026-53890

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
squirrly seo_plugin to 14.2.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability found in the SEO Plugin by Squirrly SEO versions up to and including 14.2.0. XSS allows attackers to inject malicious scripts into web pages viewed by other users without needing authentication.

Detection Guidance

Since this is an XSS vulnerability in a WordPress plugin, detection involves checking for vulnerable versions of the SEO Plugin by Squirrly SEO. Inspect plugin files for versions <= 14.2.0. Use WordPress admin panel to review installed plugins or run commands like 'wp plugin list' if using WP-CLI.

Impact Analysis

An attacker could exploit this to steal user sessions, deface websites, or redirect users to malicious sites. Since no authentication is required, the risk is higher as any user visiting the site could be affected.

Compliance Impact

This vulnerability could lead to data breaches, exposing user data which may violate GDPR or HIPAA requirements for data protection and privacy. Organizations may face fines or legal consequences if exploited.

Mitigation Strategies

Immediately update the SEO Plugin by Squirrly SEO to the latest version. If an update is unavailable, consider disabling or removing the plugin until a patch is released. Monitor the plugin's official channels for updates.

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