CVE-2026-52777: Yeswiki

Critical severity, CVSS 9.4. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Yeswiki Yeswiki: before 4.6.6 (fixed in 4.6.6)

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