Rocket.Chat up to 8.5.0 Websocket Connection Meteor.userId improper authentication

Summaryinfo

A vulnerability, which was classified as critical, has been found in Rocket.Chat up to 8.5.0. Affected is the function Meteor.userId of the component Websocket Connection Handler. This manipulation causes improper authentication. This vulnerability is handled as CVE-2026-48929. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Rocket.Chat up to 8.5.0. It has been declared as critical. Affected by this vulnerability is the function Meteor.userId of the component Websocket Connection Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect integrity, and availability. The summary by CVE is:

Rocket.Chat in versions <8.5.1, <8.4.4, <8.3.6, <8.2.6, <8.1.6, <8.0.7, <7.13.9, and <7.10.13 is vulnerable to unauthenticated file deletion. The deleteFileMessage Meteor method permanently deletes any uploaded file by ID without requiring authentication. When called via an unauthenticated DDP WebSocket connection, Meteor.userId() returns null, causing the authorization check to be skipped. Execution falls through to FileUpload.getStore('Uploads').deleteById(fileID), which removes the file from storage and database unconditionally. File IDs are discoverable from public channel message payloads and download URLs.

It is possible to read the advisory at hackerone.com. This vulnerability is known as CVE-2026-48929 since 05/26/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 7.10.13, 7.13.9, 8.0.7, 8.1.6, 8.2.6, 8.3.6, 8.4.4 or 8.5.1 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Chat Software

Name

• Rocket.Chat

Version

• 7.10.0
• 7.10.1
• 7.10.2
• 7.10.3
• 7.10.4
• 7.10.5
• 7.10.6
• 7.10.7
• 7.10.8
• 7.10.9
• 7.10.10
• 7.10.11
• 7.10.12
• 7.13.0
• 7.13.1
• 7.13.2
• 7.13.3
• 7.13.4
• 7.13.5
• 7.13.6
• 7.13.7
• 7.13.8
• 8.0
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5
• 8.0.6
• 8.1
• 8.1.0
• 8.1.1
• 8.1.2
• 8.1.3
• 8.1.4
• 8.1.5
• 8.2
• 8.2.0
• 8.2.1
• 8.2.2
• 8.2.3
• 8.2.4
• 8.2.5
• 8.3
• 8.3.0
• 8.3.1
• 8.3.2
• 8.3.3
• 8.3.4
• 8.3.5
• 8.4
• 8.4.0
• 8.4.1
• 8.4.2
• 8.4.3
• 8.5.0

License

• free

CPE 2.3info

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