CVE-2026-52762: Yeswiki

High severity, CVSS 7.1. EPSS: 0.8% chance of exploitation in the next 30 days.

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, YesWiki Bazar contains a stored Server-Side Template Injection (SSTI) vulnerability in the semantic template feature that can be escalated to confirmed Remote Code Execution (RCE). An authenticated administrator can place arbitrary Twig expressions into the Semantic template (Twig) field (bn_sem_template), and that content is later executed server-side when public semantic endpoints are requested. This issue has been patched in version 4.6.6.

Affected products

• Yeswiki Yeswiki: before 4.6.6 (fixed in 4.6.6)

Published 2026-09-05. Last modified 2026-09-08.