What’s Vulnerable › Vulnerabilities
CVE-2023-5331: File Information Leak via IDOR in file_id in Draft Posts
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-10-09 · updated 2026-06-17
- Weakness: CWE-862
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.
Affected products
- Mattermost: before 7.8.11; from 8.0.0 before 8.0.3; from 8.1.0 before 8.1.2 — fixed in 7.8.11, 8.0.3, 8.1.2
How to fix
Upgrade to a fixed version: Mattermost 7.8.11, 8.0.3, 8.1.2. Check the vendor advisory for mitigations.
References
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