Vikunja’s Scoped API tokens with projects.background permission can delete project backgrounds_CVE-2026-40103

{
    "lastseen": "",
    "description": "Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.",
    "published": "2026-04-10T16:12:27.603Z",
    "modified": "2026-04-10T16:12:27.603Z",
    "type": "cve",
    "title": "Vikunja's Scoped API tokens with projects.background permission can delete project backgrounds",
    "source": "GitHub_M",
    "references": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-v479-vf79-mg83\nhttps://github.com/go-vikunja/vikunja/pull/2584\nhttps://github.com/go-vikunja/vikunja/commit/6a0f39b252a81fa4b19dc56dc889183acc9225ae\nhttps://github.com/go-vikunja/vikunja/releases/tag/v2.3.0",
    "id": "CVE-2026-40103",
    "bulletinFamily": "",
    "cwe": [
        "CWE-836"
    ],
    "cvelist": null,
    "sourceData": "go-vikunja vikunja < 2.3.0",
    "sourceHref": "",
    "cvss": {
        "score": 4.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
        "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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            "privilegesRequired": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "vikunja",
    "version": "< 2.3.0",
    "vendor": "go-vikunja",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}