CVE-2024-50052: Arbitrary post deletion via Playbooks /ignore-thread endpoint

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: 2024-10-29 · updated 2026-06-17
Weakness: CWE-862

Description

Mattermost versions 9.10.x <= 9.10.2, 9.11.x <= 9.11.1, 9.5.x <= 9.5.9 fail to check that the origin of the message in an integration action matches with the original post metadata which allows an authenticated user to delete an arbitrary post.

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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