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CVE-2026-45689

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

Critical9.1EPSS 0.53%
Published
Updated
Reserved
Assigned by
GitHub_M

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.

Scores

CVSS scores of CVE-2026-45689, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Deferred3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.53% · top 55% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.

Weakness

Affected products

  • RocketChat · Rocket.Chat

    • affected >= 8.5.0-rc.0, < 8.5.0
    • affected >= 8.4.0-rc.0, < 8.4.1
    • affected >= 8.3.0-rc.0, < 8.3.3
    • affected >= 8.2.0-rc.0, < 8.2.3
    • affected >= 8.1.0-rc.0, < 8.1.4
    • affected >= 8.0.0-rc.0, < 8.0.5
    • affected >= 7.11.0-rc.0, < 7.13.7
    • affected < 7.10.11

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .