CVE-2023-47858 Details of archived public channels are leaked to members of another team
Attackers can view details of archived public channels from other teams due to missing permission checks, exposing sensitive channel metadata.
- 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-2023-47858?
CVE-2023-47858 is a medium-severity missing authorization 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 properly verify the permissions needed for viewing archived public channels, allowing a member of one team to get details about the archived public channels of another team via the GET /api/v4/teams/<team-id>/channels/deleted endpoint.
Weakness: CWE-284
Which versions are affected by CVE-2023-47858?
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 | 7.8.10 |
github.com/mattermost/mattermost-server/v6 Go | All versions | 7.8.10 |
mattermost Bitnami | All versions | 8.1.7, 9.0.5, 9.1.4, 9.2.3 |
github.com/mattermost/mattermost-server Go | All versions | None |
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 | 8.1.1 |
github.com/mattermost/mattermost/server/v8 Go | All versions | 8.1.1 |
Products include Mattermost Mattermost Server.
How do I fix CVE-2023-47858?
Upgrade github.com/mattermost/mattermost-server/v6 to 7.8.10 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-47858 being exploited?
There is no known exploitation of CVE-2023-47858 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-2023-47858, GHSA-w88v-pjr8-cmv2, GO-2024-2450.