YesWiki has Unsafe eval() in Formula Calculator – Remote Code Execution (RCE) & Denial of Service (DoS)_CVE-2026-52778

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-08T18:24:21.671Z",
    "modified": "2026-06-08T18:24:21.671Z",
    "type": "cve",
    "title": "YesWiki has Unsafe eval() in Formula Calculator - Remote Code Execution (RCE) & Denial of Service (DoS)",
    "source": "GitHub_M",
    "references": "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-px5m-h76g-p7p8\nhttps://github.com/YesWiki/yeswiki/commit/dd2bd8fb099de0d21504bda8a810693b3fcb8e52\nhttps://github.com/YesWiki/yeswiki/releases/tag/v4.6.6",
    "id": "CVE-2026-52778",
    "bulletinFamily": "",
    "cwe": [
        "CWE-94",
        "CWE-1333"
    ],
    "cvelist": null,
    "sourceData": "YesWiki yeswiki < 4.6.6",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "yeswiki",
    "version": "< 4.6.6",
    "vendor": "YesWiki",
    "ai_description": "Unsafe execution vulnerability in the Bazar form field calculator, allowing arbitrary PHP code execution and Regular Expression Denial of Service (ReDoS / Stack Overflow).",
    "ai_severity": "Critical",
    "ai_vendor": "YesWiki",
    "ai_product": "YesWiki",
    "ai_version": "< 4.6.6",
    "ai_score": 9.8
}