CVE-2023-5331 File Information Leak via IDOR in file_id in Draft Posts
Attackers can access unauthorized file information in draft posts due to missing creator validation, 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-2023-5331?
CVE-2023-5331 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 9 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost fails to properly check the creator of an attached file when adding the file to a draft post, potentially exposing unauthorized file information.
Weakness: CWE-862
Which versions are affected by CVE-2023-5331?
1 open source package ship an affected version, including mattermost. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mattermost Bitnami | All versions | 7.8.11, 8.0.3, 8.1.2 |
Products include Mattermost Mattermost Server.
How do I fix CVE-2023-5331?
Upgrade mattermost to a fixed version for your release line: 7.8.11, 8.0.3 or 8.1.2.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-5331 being exploited?
There is no known exploitation of CVE-2023-5331 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-2023-5331, GHSA-97wm-858v-4f4q.