CVE-2026-72918: Rocketchat Rocket.chat

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 7.10.14, 8.0.8, 8.1.7, 8.2.7, 8.3.7, 8.4.5, 8.5.2, and 8.6.1, the stream-notify-user stream in the WebSocket protocol allows an authenticated user to write arbitrary notification bodies because the sender is not checked, and the client-side UI can create an ephemeral fake message in another user's currently open chat. This issue is fixed in versions 7.10.14, 8.0.8, 8.1.7, 8.2.7, 8.3.7, 8.4.5, 8.5.2, and 8.6.1.

Affected products

• Rocketchat Rocket.chat: before 7.10.14 (fixed in 7.10.14); from 8.0.0, before 8.0.8 (fixed in 8.0.8); from 8.1.0, before 8.1.7 (fixed in 8.1.7); from 8.2.0, before 8.2.7 (fixed in 8.2.7); from 8.3.0, before 8.3.7 (fixed in 8.3.7); from 8.4.0, before 8.4.5 (fixed in 8.4.5); …

Published 2026-08-10. Last modified 2026-09-09.