The Yoast SEO Premium WordPress plugin before 27.6.1 does not sanitize control characters from redirect origins before writing them to the site's Apache configuration file when the file-based redirect mode is enabled, and the redirect-creation endpoint is reachable by users with only Author-level access. This allows such users to inject arbitrary newline-delimited Apache directives into the root .htaccess file. On Apache servers that honour PHP directives, the injection can be chained with the user's own media upload (a polyglot image carrying a PHP payload) and an autoprependfile directive to achieve Remote Code Execution.

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 (postname) 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 getpermalink() embedding the stored percent-encoded postname in the generated URL.

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 'postid' parameter, including posts owned by other users, private posts, and draft posts.

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

The Yoast SEO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘displayname’ author meta in all versions up to, and including, 22.6 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 SEO plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via URLs in all versions up to, and including, 22.5 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Team Yoast Yoast SEO allows Stored XSS.This issue affects Yoast SEO: from n/a through 21.0.

Cross-Site Request Forgery (CSRF) vulnerability in Yoast Yoast Local Premium.This issue affects Yoast Local Premium: from n/a through 14.8.

Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Yoast Yoast SEO: Local plugin <= 14.8 versions.

Auth. (contributor+) Stored Cross-Site Scripting (XSS) vulnerability in Yoast Yoast SEO: Local plugin <= 14.9 versions.

Missing Authorization vulnerability in Yoast Yoast SEO Premium.This issue affects Yoast SEO Premium: from n/a through 20.4.

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 SEO Premium plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions 25.7 to 25.9 due to a flawed regex used to remove an attribute in post content, which can be abused to inject arbitrary HTML attributes, including JavaScript event handlers. This vulnerability allows a user with Contributor access or higher to create a post containing a malicious JavaScript payload.

A vulnerability classified as problematic was found in Google Analytics Dashboard Plugin 2.1.1. Affected by this vulnerability is an unknown functionality. The manipulation leads to basic cross site scripting. The attack can be launched remotely.

Cross-site scripting (XSS) vulnerability in js/wp-seo-metabox.js in the WordPress SEO by Yoast plugin before 2.2 for WordPress allows remote attackers to inject arbitrary web script or HTML via the posttitle parameter to wp-admin/post-new.php, which is not properly handled in the snippet preview functionality.

Cross-site scripting (XSS) vulnerability in the Google Analytics by Yoast (google-analytics-for-wordpress) plugin before 5.1.3 for WordPress allows remote attackers to inject arbitrary web script or HTML via the "Manually enter your UA code" (manualuacodefield) field in the General Settings.

Multiple SQL injection vulnerabilities in admin/class-bulk-editor-list-table.php in the WordPress SEO by Yoast plugin before 1.5.7, 1.6.x before 1.6.4, and 1.7.x before 1.7.4 for WordPress allow remote authenticated users to execute arbitrary SQL commands via the (1) orderby or (2) order parameter in the wpseobulk-editor page to wp-admin/admin.php. NOTE: this can be leveraged using CSRF to allow remote attackers to execute arbitrary SQL commands.

Multiple cross-site request forgery (CSRF) vulnerabilities in admin/class-bulk-editor-list-table.php in the WordPress SEO by Yoast plugin before 1.5.7, 1.6.x before 1.6.4, and 1.7.x before 1.7.4 for WordPress allow remote attackers to hijack the authentication of certain users for requests that conduct SQL injection attacks via the (1) orderby or (2) order parameter in the wpseobulk-editor page.

Cross-site scripting (XSS) vulnerability in admin/googlesearchconsole/class-gsc-table.php in the Yoast SEO plugin before 5.8.0 for WordPress allows remote attackers to inject arbitrary web script or HTML.

A Race condition vulnerability in unzipfile in admin/import/class-import-settings.php in the Yoast SEO (wordpress-seo) plugin before 9.2.0 for WordPress allows an SEO Manager to perform command execution on the Operating System via a ZIP import.

The Yoast SEO plugin before 11.6-RC5 for WordPress does not properly restrict unfiltered HTML in term descriptions.

The yoastseo (aka Yoast SEO) extension before 7.2.3 for TYPO3 allows XSS.

The yoastseo (aka Yoast SEO) extension before 7.2.1 for TYPO3 allows SSRF via a backend user account.

The Yoast SEO WordPress plugin (from versions 16.7 until 17.2) discloses the full internal path of featured images in posts via the wp/v2/posts REST endpoints which could help an attacker identify other vulnerabilities or help during the exploitation of other identified vulnerabilities.

A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin before 3.4.1, which had built-in blacklist filters which were blacklisting Parenthesis as well as several functions such as alert but bypasses were found.