What’s Vulnerable › Vulnerabilities

CVE-2022-4044: Authenticated user could send multiple requests containing a large Auto Responder Message payload and can crash a Mattermost server

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-11-23 · updated 2026-06-17
• Weakness: CWE-770

Description

A denial-of-service vulnerability in Mattermost allows an authenticated user to crash the server via multiple large autoresponder messages.

Affected products

• Mattermost App Framework: before 7.4 — fixed in 7.4

How to fix

Upgrade to a fixed version: Mattermost App Framework 7.4. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/1680241
• https://mattermost.com/security-updates/
• https://hackerone.com/reports/1680241
• https://mattermost.com/security-updates/

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