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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Wordpress Seo Premium Plugin | — | Update wordpress-seo-premium plugin to version 27.6.1, or a newer patched version | Oct 30, 2026 | Jun 4, 2026 |
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