EUVD-2026-14273
GHSA-84j4-wrx9-vrgx
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
The Yoast SEO - Advanced SEO with real-time guidance and built-in AI plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the `jsonText` block attribute in all versions up to, and including, 27.1.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Analysis
A Stored Cross-Site Scripting (XSS) vulnerability exists in Yoast SEO plugin for WordPress versions up to 27.1.1, where the `jsonText` block attribute fails to properly sanitize and escape user input, allowing authenticated contributors and above to inject malicious scripts that execute in the browsers of all users accessing the compromised pages. The vulnerability has a CVSS score of 6.4 (Medium severity) and requires only low-level authenticated access with no user interaction needed for payload execution, though it is limited to authenticated attackers and does not affect confidentiality or availability significantly.
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Remediation
Within 30 days: Identify affected systems running all and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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