Account Takeover via Code Exchange Endpoint_CVE-2025-12421

{
    "lastseen": "",
    "description": "Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled).",
    "published": "2025-11-27T17:47:04.944Z",
    "modified": "2025-11-27T17:47:04.944Z",
    "type": "cve",
    "title": "Account Takeover via Code Exchange Endpoint",
    "source": "Mattermost",
    "references": "https://mattermost.com/security-updates",
    "id": "CVE-2025-12421",
    "bulletinFamily": "",
    "cwe": [
        "CWE-303"
    ],
    "cvelist": null,
    "sourceData": "Mattermost Mattermost 11.0.0\nMattermost Mattermost 10.12.0\nMattermost Mattermost 10.11.0\nMattermost Mattermost 10.5.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.9,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Mattermost",
    "version": "11.0.0",
    "vendor": "Mattermost",
    "ai_description": "Account takeover via code exchange endpoint vulnerability",
    "ai_severity": "Critical",
    "ai_vendor": "Mattermost",
    "ai_product": "Mattermost",
    "ai_version": "11.0.0, 10.12.0, 10.11.0, 10.5.0",
    "ai_score": 9.9
}