Yoast vulnerabilities

Missing Authorization vulnerability in Yoast BV Yoast SEO Premium allows Exploiting Incorrectly Configured Access Control Security Levels. This issue affects Yoast SEO Premium: from n/a through 26.6.

Yoast Duplicate Post through 4.6 inserts an unescaped post title and permalink into the Classic Editor scheduled republish notice. Attackers can schedule a republish copy with a crafted title to execute script when an administrator views the resulting notice.

Yoast Duplicate Post through 4.6 contains a cross-site request forgery vulnerability in the duplicate_post_dismiss_notice handler, which verifies no nonce or capability. Attackers can trick any authenticated user into sending a request that sets the duplicate_post_show_notice site option, suppressing admin notices network-wide.

The Yoast SEO plugin for WordPress is vulnerable to Insecure Direct Object References in all versions up to, and including, 26.5. This is due to insufficient authorization checks in the Meta Search REST API endpoint that fail to verify post ownership. This makes it possible for authenticated attackers, with Contributor-level access and above, to read sensitive SEO metadata from any post on the site via the 'post_id' parameter, including posts owned by other users, private posts, and draft posts.

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.

The Yoast Duplicate Post plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the clone_bulk_action_handler() and republish_request() functions in all versions up to, and including, 4.5. This makes it possible for authenticated attackers, with Contributor-level access and above, to duplicate any post on the site including private, draft, and trashed posts they shouldn't have access to. Additionally, attackers with Author-level access and above can use the Rewrite & Republish feature to overwrite any published post with their own content.

Yoast Duplicate-Post WordPress Plugin 3.2.3 contains a persistent cross-site scripting vulnerability in plugin settings parameters. Attackers can inject malicious scripts into title prefix, suffix, menu order, and blacklist fields to execute arbitrary JavaScript in admin interfaces.

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 `yoast-schema` block attribute in all versions up to, and including, 26.8 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.