CVE-2023-48732 Keywords that trigger mentions are leaked to other users
Mattermost leaks notification details to all channel members via WebSocket, exposing who was mentioned in a post.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-48732?
CVE-2023-48732 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 2 Jan 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.
Weakness: CWE-200
Which versions are affected by CVE-2023-48732?
9 open source packages ship an affected version, including github.com/mattermost/mattermost-server/v6, mattermost and github.com/mattermost/mattermost-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/mattermost/mattermost-server/v6 Go | All versions | None |
github.com/mattermost/mattermost-server/v6 Go | All versions | 8.1.7 |
github.com/mattermost/mattermost-server/v6 Go | All versions | 8.1.7 |
mattermost Bitnami | All versions | 8.1.7 |
github.com/mattermost/mattermost-server Go | All versions | 8.1.7+incompatible |
github.com/mattermost/mattermost-server/v5 Go | All versions | None |
3 more packages
github.com/mattermost/mattermost/server/v8 Go | All versions | None |
github.com/mattermost/mattermost/server/v8 Go | All versions | 8.1.7 |
github.com/mattermost/mattermost/server/v8 Go | All versions | 8.1.7 |
Products include Mattermost Mattermost Server.
How do I fix CVE-2023-48732?
Upgrade github.com/mattermost/mattermost-server/v6 to 8.1.7 or later.
Is CVE-2023-48732 being exploited?
There is no known exploitation of CVE-2023-48732 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost Server
- CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers
- CVE-2025-12421 Account Takeover via Code Exchange Endpoint
- CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User
- CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards
- CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive
Sources
Also known as BIT-mattermost-2023-48732, GHSA-q7rx-w656-fwmv, GO-2024-2448.