CVE-2026-15425
Received Received - Intake

Stored XSS in Yoast SEO WordPress Plugin via Post Slug

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: Wordfence

Description
The Yoast SEO – Advanced SEO with real-time guidance and built-in AI plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Post Slug (post_name) in all versions up to, and including, 28.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires pretty permalinks to be enabled, as the exploit chain depends on get_permalink() embedding the stored percent-encoded post_name in the generated URL.

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Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-07-25
AI Q&A
2026-07-25
EPSS Evaluated
N/A
NVD
CVE-2026-15425
EUVD
EUVD-2026-48765

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
yoast seo to 28.0 (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 vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Yoast SEO WordPress plugin. It allows authenticated attackers with author-level access or higher to inject malicious scripts via the Post Slug (post_name) field. The scripts execute when users visit affected pages, but only if pretty permalinks are enabled.

Detection Guidance

Check WordPress plugins for Yoast SEO versions up to 28.0. Inspect post slugs for unusual characters or scripts. Enable WordPress debugging to log suspicious inputs. Review server access logs for unexpected URL patterns containing percent-encoded payloads.

Impact Analysis

If exploited, this vulnerability could allow attackers to steal user sessions, deface websites, or redirect visitors to malicious sites. It requires an attacker to have at least author-level access to the WordPress site.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized script injection in WordPress pages. Authenticated attackers with author-level access could inject malicious scripts via post slugs, which may lead to data exfiltration or unauthorized actions if exploited. This could violate data protection requirements under GDPR (e.g., integrity and confidentiality) and HIPAA (e.g., safeguarding protected health information).

Mitigation Strategies

Update Yoast SEO plugin to the latest version. Disable pretty permalinks temporarily if possible. Sanitize existing post slugs to remove any injected scripts. Implement strict input validation for post slugs. Monitor user roles to restrict author-level access.

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