CVE-2026-12157 is a stored cross-site scripting vulnerability in the BetterDocs – AI Documentation, Knowledge Base, Docs, Wikis, FAQ with Chatbot WordPress plugin by wpdevteam. The vulnerability stems from insufficient input sanitization and output escaping in the CategorySlateLayout::render() method, which directly outputs the blockId attribute into an HTML class attribute without using esc_attr(). This flaw allows authenticated attackers with contributor-level or higher privileges to inject arbitrary JavaScript code that executes in the context of users viewing the injected pages. The affected versions are all versions up to and including 4.5.3.

An attacker with contributor-level or higher access can inject malicious scripts that execute in the browsers of users who visit the compromised pages. This can lead to theft of user credentials, session hijacking, or other malicious actions performed in the context of the affected site. The vulnerability does not affect availability but impacts confidentiality and integrity of user data.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider removing or disabling the vulnerable Gutenberg block if possible. Monitor vendor channels for updates and apply patches promptly once released.