CVE-2026-52778

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, an unsafe execution vulnerability exists in the Bazar form field calculator (CalcField.php) of YesWiki. The application attempts to sanitize user-defined mathematical formulas using a complex recursive regular expression before passing them to the PHP eval() function. This implementation is inherently flawed: it is vulnerable to Regular Expression Denial of Service (ReDoS / Stack Overflow) which can crash the server, and it creates a high-risk architecture where any logic bypass directly results in arbitrary PHP code execution. Version 4.6.6 patches the issue.

• CWE-94
• CWE-1333

• https://github.com/YesWiki/yeswiki/commit/dd2bd8fb099de0d21504bda8a810693b3fcb8e52
• https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6
• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-px5m-h76g-p7p8
• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-px5m-h76g-p7p8

Published

Jun 8, 2026

Last Modified

Jul 23, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-52758Ghidra before 12.1 contains a SQL injection vulnerability in…8.8
• CVE-2026-52759Ghidra before 12.1.1 contains an uncontrolled memory allocat…6.7
• CVE-2026-5276Insufficient policy enforcement in WebUSB in Google Chrome p…6.5
• CVE-2026-52760Improper Neutralization of Input During Web Page Generation …6.1
• CVE-2026-52761ModSecurity is an open source, cross platform web applicatio…5.3
• CVE-2026-5277Integer overflow in ANGLE in Google Chrome on Windows prior …7.5
• CVE-2026-52779OpenProject is open-source, web-based project management sof…5.4
• CVE-2026-5278Use after free in Web MIDI in Google Chrome on Android prior…8.8
• CVE-2026-52780OpenProject is open-source, web-based project management sof…9.6
• CVE-2026-52781OpenProject is open-source, web-based project management sof…6.4
• CVE-2026-52782OpenProject is open-source, web-based project management sof…9.9
• CVE-2026-52783OpenProject is open-source, web-based project management sof…8.2