Yeswiki - Yeswiki - CRITICAL - CVE-2026-52766. A vulnerability in YesWiki allows users with default page write access to execute the {{erasespamedcomments}} action without proper authorization checks. This can lead to permanent deletion of arbitrary wiki pages, including crucial system and user pages. The issue arises from the action's reliance on the 'suppr[]' array from POST requests, permitting any user to exploit this functionality. This vulnerability has been addressed in version 4.6.6, highlighting the importance of upgrading to secure your wiki.