CVE-2026-17532

Description

The Seraphinite Accelerator plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the -seraph_accel_prep- parameter in versions up to, and including, 2.29.15. This is due to the CacheExtractPreparePageParams() function using PHP-s loose inequality operator (!=) to compare the expected HMAC string against the JSON-decoded -nonce- value — supplying the JSON boolean true causes any non-empty HMAC string to compare as loosely equal, bypassing the signature check — combined with insufficient output escaping in the _CbContentFinishSkip() function, which concatenates the attacker-controlled -selfTest- field directly into the HTML response body. 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 specially crafted link.