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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-15425
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 07:17:09 UTC
Updated2026-07-27 20:25:13 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.002010000 probability, percentile 0.102260000 (date 2026-07-29)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Yoast Yoast SEO Advanced SEO With Real-time Guidance And Built-in AI affected 28.0 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/wordpress-seo/tags/28.0/admin/class-bulk-editor-list-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.6/admin/class-bulk-editor-list-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/wordpress-seo/tags/28.0/admin/class-bulk-editor-list-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/4b2fa1b7-a5af-4ea6-9bee-19a6c... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.6/admin/class-bulk-editor-list-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3598937/wordpress-seo/trunk/admin/class-bulk-editor... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Dmitrii Ignatyev (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-24T17:58:17.000ZDisclosed

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