What’s Vulnerable › Vulnerabilities
CVE-2023-5876: Regex DoS from a malicious server enrolled in Desktop
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-11-02 · updated 2026-06-17
- Weakness: CWE-400
Description
Mattermost fails to properly validate a RegExp built off the server URL path, allowing an attacker in control of an enrolled server to mount a Denial Of Service.
Affected products
- Mattermost Desktop: before 5.5.1 — fixed in 5.5.1
How to fix
Upgrade to a fixed version: Mattermost Desktop 5.5.1. Check the vendor advisory for mitigations.
References
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