Rocket.Chat: Pre-Auth NoSQL Injection in OAuth2 Token Endpoint leading to Arbitrary User ATO_CVE-2026-45689

{
    "lastseen": "",
    "description": "Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, an unauthenticated network attacker obtains a valid Rocket.Chat OAuth access token for an arbitrary user by sending a single HTTP POST with MongoDB query operators to /oauth/token. The Rocket.Chat OAuth2 server does not validate that grant parameters are strings before forwarding them to findOne({...}) against the oauth_apps and oauth_access_tokens collections, so an attacker substitutes {\"$ne\": null} for client_id, client_secret, and refresh_token and receives a freshly minted {access_token, refresh_token} pair bound to whichever user's refresh token Mongo returned first. The resulting access token is a first-class bearer credential against the full /api/v1/* surface as that user. By iterating with $nin / $regex operators the attacker walks the entire oauth_access_tokens collection, collecting one fresh access token per user per request. If any matched token belongs to an admin, the stolen bearer gives full admin API access (including Apps-Engine app installation, i.e. server-side code execution). No account, credentials, userId, or prior interaction with the instance are required. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.",
    "published": "2026-06-24T20:57:32.281Z",
    "modified": "2026-06-24T20:57:32.281Z",
    "type": "cve",
    "title": "Rocket.Chat: Pre-Auth NoSQL Injection in OAuth2 Token Endpoint leading to Arbitrary User ATO",
    "source": "GitHub_M",
    "references": "https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-8p25-fm45-pjrw",
    "id": "CVE-2026-45689",
    "bulletinFamily": "",
    "cwe": [
        "CWE-943"
    ],
    "cvelist": null,
    "sourceData": "RocketChat Rocket.Chat >= 8.5.0-rc.0, < 8.5.0\nRocketChat Rocket.Chat >= 8.4.0-rc.0, < 8.4.1\nRocketChat Rocket.Chat >= 8.3.0-rc.0, < 8.3.3\nRocketChat Rocket.Chat >= 8.2.0-rc.0, < 8.2.3\nRocketChat Rocket.Chat >= 8.1.0-rc.0, < 8.1.4\nRocketChat Rocket.Chat >= 8.0.0-rc.0, < 8.0.5\nRocketChat Rocket.Chat >= 7.11.0-rc.0, < 7.13.7\nRocketChat Rocket.Chat < 7.10.11",
    "sourceHref": "",
    "cvss": {
        "score": 9.1,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Rocket.Chat",
    "version": ">= 8.5.0-rc.0, < 8.5.0",
    "vendor": "RocketChat",
    "ai_description": "Pre-Auth NoSQL Injection in OAuth2 Token Endpoint leading to Arbitrary User ATO",
    "ai_severity": "Critical",
    "ai_vendor": "RocketChat",
    "ai_product": "Rocket.Chat",
    "ai_version": "<= 8.5.0-rc.0, < 8.5.0, <= 8.4.0-rc.0, < 8.4.1, <= 8.3.0-rc.0, < 8.3.3, <= 8.2.0-rc.0, < 8.2.3, <= 8.1.0-rc.0, < 8.1.4, <= 8.0.0-rc.0, < 8.0.5, <= 7.11.0-rc.0, < 7.13.7, < 7.10.11",
    "ai_score": 9.1
}