What’s Vulnerable › Vulnerabilities
CVE-2024-39837: Malicious remote can create arbitrary channels
- Severity: medium (CVSS 5.4 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: 2024-08-01 · updated 2026-06-17
- Weakness: CWE-284
Description
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6 fail to properly restrict channel creation which allows a malicious remote to create arbitrary channels, when shared channels were enabled.
Affected products
- Mattermost: from 9.5.0 before 9.5.7; 9.9.0 — fixed in 9.5.7
How to fix
Upgrade to a fixed version: Mattermost 9.5.7. Check the vendor advisory for mitigations.
References
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