Decidim has a Cross-site scripting (XSS) vulnerability via user name field_CVE-2026-23891

{
    "lastseen": "",
    "description": "Decidim is a participatory democracy framework. In versions below 0.30.5 and 0.31.0.rc1 through 0.31.0, a stored code execution vulnerability in the user name field allows a low-privileged attacker to execute arbitrary code in the context of any user who passively visits a comment page, resulting in high confidentiality and integrity impact across security boundaries. This issue has been fixed in versions 0.30.5 and 0.31.1.",
    "published": "2026-04-13T16:52:16.448Z",
    "modified": "2026-04-13T16:52:16.448Z",
    "type": "cve",
    "title": "Decidim has a Cross-site scripting (XSS) vulnerability via user name field",
    "source": "GitHub_M",
    "references": "https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g\nhttps://github.com/decidim/decidim/releases/tag/v0.30.5\nhttps://github.com/decidim/decidim/releases/tag/v0.31.1",
    "id": "CVE-2026-23891",
    "bulletinFamily": "",
    "cwe": [
        "CWE-79"
    ],
    "cvelist": null,
    "sourceData": "decidim decidim >= 0.31.0.rc1, < 0.31.1\ndecidim decidim < 0.30.5",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L",
        "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": "decidim",
    "version": ">= 0.31.0.rc1, < 0.31.1",
    "vendor": "decidim",
    "ai_description": "Stored code execution vulnerability in the user name field, allowing a low-privileged attacker to execute arbitrary code in the context of any user who passively visits a comment page.",
    "ai_severity": "Critical",
    "ai_vendor": "Decidim",
    "ai_product": "Decidim",
    "ai_version": "<= 0.31.0.rc1, < 0.30.5",
    "ai_score": 9.3
}