PT-2026-47441 · Yeswiki · Yeswiki

Published 2026-06-08 · Updated 2026-06-08 · CVE-2026-52778

NVD

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Code Injection

DoS

Weakness Enumeration

CWE-94

CWE-1333

Related Identifiers

CVE-2026-52778

Affected Products

Yeswiki

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-52778 · Security Note
• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-px5m-h76g-p7p8 · Note
• https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6 · Note
• https://github.com/YesWiki/yeswiki/commit/dd2bd8fb099de0d21504bda8a810693b3fcb8e52 · Note