CVE-2023-3590 Deleted attachments in Boards remain accessible
Attackers can access deleted card attachments in Mattermost Boards due to improper authorization checks, exposing sensitive data.
- 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-2023-3590?
CVE-2023-3590 is a low-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 17 Jul 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost fails to delete card attachments in Boards, allowing an attacker to access deleted attachments.
Weakness: CWE-863
Which versions are affected by CVE-2023-3590?
1 open source package ship an affected version, including mattermost. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mattermost Bitnami | From 7.10.0 | 7.10.3 |
Products include Mattermost Mattermost Server.
How do I fix CVE-2023-3590?
Upgrade mattermost to 7.10.3 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-3590 being exploited?
There is no known exploitation of CVE-2023-3590 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-2023-3590, GHSA-h9fc-695x-fc5x.