CVE-2026-15425 Yoast SEO <= 28.0 - Authenticated (Author+) Stored Cross-Site Scripting via Post Slug (post_name)
Authenticated attackers can inject scripts via post slugs in Yoast SEO, executing them when users view pages, requiring pretty permalinks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15425?
CVE-2026-15425 is a medium-severity cross-site scripting vulnerability in Yoast SEO – Advanced SEO with real-time guidance and built-in AI, published on 25 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-15425?
How do I fix CVE-2026-15425?
No fix has been published for CVE-2026-15425 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-15425 being exploited?
There is no known exploitation of CVE-2026-15425 in the wild and no public exploit code.
Sources
Also known as GHSA-6qx8-mxxj-98fc.