NamelessMC: OAuth callback `state` is not validated, allowing login CSRF / session swapping_CVE-2026-34460

{
    "lastseen": "",
    "description": "NamelessMC is website software for Minecraft servers. In versions 2.2.4 and prior, the OAuth callback handling does not validate the state parameter server-side before exchanging the authorization code. This allows an attacker to capture a valid OAuth callback URL for their own account and cause a victim's browser to navigate to it, resulting in the victim's session being authenticated as the attacker-linked account (OAuth login CSRF / session swapping). This is patched in version 2.2.5.",
    "published": "2026-06-02T15:29:14.648Z",
    "modified": "2026-06-02T15:29:14.648Z",
    "type": "cve",
    "title": "NamelessMC: OAuth callback `state` is not validated, allowing login CSRF / session swapping",
    "source": "GitHub_M",
    "references": "https://github.com/NamelessMC/Nameless/security/advisories/GHSA-pmpw-2xvh-5xj6",
    "id": "CVE-2026-34460",
    "bulletinFamily": "",
    "cwe": [
        "CWE-302",
        "CWE-346",
        "CWE-352"
    ],
    "cvelist": null,
    "sourceData": "NamelessMC Nameless < 2.2.5",
    "sourceHref": "",
    "cvss": {
        "score": 5.4,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/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": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Nameless",
    "version": "< 2.2.5",
    "vendor": "NamelessMC",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}