CVE-2026-1667
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
The SEO Plugin by Squirrly SEO for WordPress up to version 14.0.0 is vulnerable to arbitrary post creation and stored cross-site scripting due to an API token leak and insufficient input sanitization and output escaping. Unauthenticated attackers can create arbitrary posts and, if Advanced Custom Fields is active, inject persistent scripts that execute when users visit affected pages.
Risk Assessment
Attackers can create arbitrary content without authentication, leading to defacement or malicious content distribution. With Advanced Custom Fields enabled, persistent XSS can steal user sessions or redirect visitors to malicious sites, compromising site integrity and user trust.
Recommendation
Update the SEO Plugin by Squirrly SEO to the latest version immediately. If an update is unavailable, temporarily disable the plugin and Advanced Custom Fields until a patch is applied.
Related vulnerabilities
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Original NVD description (English source)
The SEO Plugin by Squirrly SEO plugin for WordPress is vulnerable to Arbitrary Post Creation and Stored Cross-Site Scripting in all versions up to, and including, 14.0.0 due to a leak of an API token and insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to create arbitrary posts, and, if the Advanced Custom Fields plugin is installed and activated, inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

