Yoast SEO <= 28.0 - Authenticated (Author+) Stored Cross-Site Scripting via Post Slug (post_name)
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-15425
- 2026-10-03 Alias added: GHSA-6qx8-mxxj-98fc
References
Other 7
- https://www.wordfence.com/threat-intel/vulnerabilities/id/4b2fa1b7-a5af-4ea6-9bee-19a6cdfd7701?source=cve
- https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/28.0/admin/class-bulk-editor-list-table.php#L900
- https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/28.0/admin/class-bulk-editor-list-table.php#L898
- https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.6/admin/class-bulk-editor-list-table.php#L900
- https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.6/admin/class-bulk-editor-list-table.php#L898
- https://plugins.trac.wordpress.org/changeset/3598937/wordpress-seo/trunk/admin/class-bulk-editor-list-table.php
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fwordpress-seo/tags/28.0&new_path=%2Fwordpress-seo/tags/28.1
More Yoast vulnerabilities
- TI-2017-14158 Google Analytics Dashboard Plugin cross site scriting CVSS 3.1MEDIUM 6.1
- TI-2019-15368 Duplicate-Post 3.2.3 - Persistent Cross-Site Scripting CVSS 4.0MEDIUM 4.8
- TI-2019-10120 The Yoast SEO plugin before 11.6-RC5 for WordPress does not properly restrict unfiltered HTML in term descriptions. CVSS 3.1CRITICAL 9.8
- TI-2023-13290 WordPress Yoast SEO: Local Plugin <= 14.8 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
- TI-2015-02025 Multiple SQL injection vulnerabilities in admin/class-bulk-editor-list-table.php in the… CVSS 2.0MEDIUM 6.5
- TI-2018-13725 A Race condition vulnerability in unzip_file in admin/import/class-import-settings.php in… CVSS 3.0MEDIUM 6.6
Sources
- CVE-2026-15425 · CVE Program
- CVE-2026-15425 · NVD
- FIRST EPSS
- GHSA-6qx8-mxxj-98fc · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences