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CVE-2026-10821

MEDIUM 6.6 CVSS 3.1
Published
September 2, 2026
Last modified
September 3, 2026
NVD status
Deferred
Reported by
contact@wpscan.com
Weakness
CWE-74
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

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.

Affected products and versions

  • Unknown Yoast SEO Premium — Before 27.6.1

References

  • wpscan.com https://wpscan.com/vulnerability/2ddd8362-7248-48de-aab9-74c70e7d5dd6/
  • yoast.com https://yoast.com/yoast-seo-premium-may-26-2026/
  • nvd.nist.gov Official NVD record