CVE-2026-55762: Rocketchat Rocket.chat

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13, the POST /api/v1/fingerprint REST endpoint enforces authentication (authRequired: true) but performs no authorization check. Any authenticated user — including a standard user role account — can call this endpoint with {"setDeploymentAs": "new-workspace"} to permanently deregister the workspace from Rocket.Chat Cloud. This wipes all cloud credentials, removes the workspace license, breaks push notifications for all users, and requires manual re-registration to recover. This vulnerability is fixed in 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13.

Affected products

• Rocketchat Rocket.chat: from 8.5.0-rc.0, before 8.5.1 (fixed in 8.5.1); from 8.4.0-rc.0, before 8.4.4 (fixed in 8.4.4); from 8.3.0-rc.0, before 8.3.6 (fixed in 8.3.6); from 8.2.0-rc.0, before 8.2.6 (fixed in 8.2.6); from 8.1.0-rc.0, before 8.1.6 (fixed in 8.1.6); from 7.11.0-rc.0, before 8.0.7 (fixed in 8.0.7); …

Published 2026-06-24. Last modified 2026-06-25.