CVE-2026-10821

The record

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 packages

Related vulnerabilities

• CVE-2026-114577 A vulnerability was found in oretnom23 php-travel-agency-system. CWE-74
• CVE-2026-114575 A flaw has been found in TOTOLINK A950RG 4.1.2cu.5268_B20221104. CWE-74
• CVE-2026-112150 A security flaw has been discovered in vraj404 Criminal-Management-System up to… CWE-74
• CVE-2026-112141 A vulnerability was determined in satya-vinay Events-Management-System up to… CWE-74
• CVE-2026-112100 A vulnerability was determined in DeepPavlov up to 1.7.0. CWE-74
• CVE-2026-112087 A weakness has been identified in itsourcecode Online Cake Ordering System 1.0. CWE-74
• CVE-2026-111991 A security vulnerability has been detected in WongKinYiu yolov9 0.1. CWE-74
• CVE-2026-111986 A vulnerability was determined in AUTOMATIC1111 stable-diffusion-webui up to 1.10.1. CWE-74