CVE-2026-15425

Yoast SEO <= 28.0 - Authenticated (Author+) Stored Cross-Site Scripting via Post Slug (post_name)

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.

We have discovered 4,044,506 live websites that are affected by CVE-2026-15425.

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Affected Software

Product  Yoast SEO
Category Search Engine Optimization
Vulnerable Domains4,044,506 live websites (100% of Yoast SEO install base)
Vulnerable Versions
  • from 0 through 28
Vulnerable Versions Count322 versions ( 100% of all versions)


Common Weakness Enumeration

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')



Details

  • Published - Jul 25, 2026
  • Updated - Jul 27, 2026

Credits

  • Dmitrii Ignatyev (finder)

Website Distribution by Country

Number of websites using CVE-2026-15425
United States1,359,250 websites


Germany401,950 websites
France278,396 websites
GB201,611 websites
Netherlands185,265 websites
Italy168,549 websites
Spain119,107 websites
Poland93,980 websites
Canada91,525 websites
Russia87,527 websites

Website Distribution by TLD

Number of websites using CVE-2026-15425
.com1,722,033 websites
.de252,618 websites
.org178,921 websites
.nl171,208 websites
.co.uk136,007 websites
.fr133,681 websites
.it126,610 websites
.net94,365 websites
.ru74,243 websites
.com.au73,351 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-15425

Top websites that are affected by CVE-2026-15425. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
***************.org United States***
******.net United States***
****************.com United States***
******.org United States***
*********.de Germany***
****.*****.com United States***
*******.com United States***
*****.com United States***
*********.com United States***
******.org United States***
See full domain list

FAQ

CVE-2026-15425 is Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Yoast SEO
A total of 4,044,506 websites have been identified as vulnerable to CVE-2026-15425, based on global website indexing conducted by WebTechSurvey.
The Yoast SEO is affected by the CVE-2026-15425 vulnerability.
Yoast SEO versions up to and including 28 are vulnerable to CVE-2026-15425.

References