Docmost is vulnerable to stored Cross-Site Scripting (XSS) through Mermaid rendering_CVE-2026-23630

{
    "lastseen": "",
    "description": "Docmost is open-source collaborative wiki and documentation software. In versions 0.3.0 through 0.23.2, Mermaid code block rendering is vulnerable to stored Cross-Site Scripting (XSS). The frontend can render attacker-controlled Mermaid diagrams using mermaid.render(), then inject the returned SVG/HTML into the DOM via dangerouslySetInnerHTML without sanitization. Mermaid per-diagram %%{init}%% directives allow overriding securityLevel and enabling htmlLabels, permitting arbitrary HTML/JS execution for any viewer. This issue has been fixed in version 0.24.0.",
    "published": "2026-01-21T22:51:27.158Z",
    "modified": "2026-01-22T16:49:01.024Z",
    "type": "cve",
    "title": "Docmost is vulnerable to stored Cross-Site Scripting (XSS) through Mermaid rendering",
    "source": "GitHub_M",
    "references": "https://github.com/docmost/docmost/security/advisories/GHSA-r4hj-mc62-jmwj\nhttps://github.com/docmost/docmost/commit/cb9f27da9a8b4940760e37e5238a1eb91e427daf\nhttps://github.com/docmost/docmost/releases/tag/v0.24.0",
    "id": "CVE-2026-23630",
    "bulletinFamily": "",
    "cwe": [
        "CWE-79",
        "CWE-116"
    ],
    "cvelist": null,
    "sourceData": "docmost docmost >= 0.3.0, < 0.24.0",
    "sourceHref": "",
    "cvss": {
        "score": 6.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "docmost",
    "version": ">= 0.3.0, < 0.24.0",
    "vendor": "docmost",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}