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 auto_prepend_file directive to achieve Remote Code Execution.
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Wed, 02 Sep 2026 10:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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 auto_prepend_file directive to achieve Remote Code Execution. | |
| Title | Yoast SEO Premium < 27.6.1 - Author+ Arbitrary .htaccess Directive Injection to RCE | |
| Weaknesses | CWE-74 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: WPScan
Published:
Updated: 2026-09-02T14:57:38.690Z
Reserved: 2026-06-04T07:41:54.109Z
Link: CVE-2026-10821
Updated: 2026-09-02T14:44:37.234Z
Status : Received
Published: 2026-09-02T15:17:37.267
Modified: 2026-09-02T15:17:37.267
Link: CVE-2026-10821
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