What’s Vulnerable › Vulnerabilities
CVE-2024-9155: Insufficient Authorization On Unlinked Channel Files
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-09-26 · updated 2026-06-17
- Weakness: CWE-863
Description
Mattermost versions 9.10.x <= 9.10.1, 9.9.x <= 9.9.2, 9.5.x <= 9.5.8 fail to limit access to channels files that have not been linked to a post which allows an attacker to view them in channels that they are a member of.
Affected products
- Mattermost: from 9.5.0 before 9.5.9; from 9.9.0 before 9.9.3; from 9.10.0 before 9.10.2 — fixed in 9.10.2, 9.5.9, 9.9.3
How to fix
Upgrade to a fixed version: Mattermost 9.10.2, 9.5.9, 9.9.3. Check the vendor advisory for mitigations.
References
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