CVE-2024-47401: DoS via Amplified GraphQL Response in Playbooks

Severity: high (CVSS 7.5 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: 2024-10-29 · updated 2026-06-17
Weakness: CWE-770

Description

Mattermost versions 9.10.x <= 9.10.2, 9.11.x <= 9.11.1 and 9.5.x <= 9.5.9 fail to prevent detailed error messages from being displayed in Playbooks which allows an attacker to generate a large response and cause an amplified GraphQL response which in turn could cause the application to crash by sending a specially crafted request to Playbooks.

Affected products

Mattermost: from 9.5.0 before 9.5.10; from 9.10.0 before 9.10.3; from 9.11.0 before 9.11.2 — fixed in 9.10.3, 9.11.2, 9.5.10

How to fix

Upgrade to a fixed version: Mattermost 9.10.3, 9.11.2, 9.5.10. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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