CVE-2026-72918 Rocket.Chat: Insecure implementation of websocket notifications
Authenticated users can inject fake messages into other users' chats due to missing sender validation in WebSocket notifications.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-72918?
CVE-2026-72918 is a medium-severity missing authorization vulnerability in RocketChat Rocket.Chat, published on 10 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-72918?
How do I fix CVE-2026-72918?
No fix has been published for CVE-2026-72918 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-72918 being exploited?
There is no known exploitation of CVE-2026-72918 in the wild and no public exploit code.
Sources
Also known as GHSA-27jx-236m-3f5j.