CVE-2026-52777

Critical

Description

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, there is an authenticated PHP object injection vulnerability in BazarImportAction via unserialize. This issue has been patched in version 4.6.6.

SeverityCritical

CVSS9.4

Exploit probability—

ProductYeswiki/yeswiki

PublishedSep 5, 2026

First seenSep 5, 2026

Weakness typeCWE-352Cross-site request forgery (CSRF)CWE-502Deserialization of untrusted data

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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