CVE-2026-52762
High
Description
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.
SeverityHigh
CVSS7.1
Exploit probability—
ProductYeswiki/yeswiki
PublishedSep 5, 2026
First seenSep 5, 2026
Weakness typeCWE-1336CWE-1336
How to fix
Update
- yeswiki/yeswiki4.6.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| yeswiki/yeswikiPackagist | v < 4.6.6 | 4.6.6 |
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