CVE-2024-12247: Improper propagation of permission scheme updates across cluster nodes

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-12-05 · updated 2026-06-17
Weakness: CWE-863

Description

Mattermost versions 9.7.x <= 9.7.5, 9.8.x <= 9.8.2 and 9.9.x <= 9.9.2 fail to properly propagate permission scheme updates across cluster nodes which allows a user to keep old permissions, even if the permission scheme has been updated.

Affected products

Mattermost: from 9.7.0 before 9.7.6; from 9.8.0 before 9.8.3; from 9.9.0 before 9.9.3 — fixed in 9.7.6, 9.8.3, 9.9.3

How to fix

Upgrade to a fixed version: Mattermost 9.7.6, 9.8.3, 9.9.3. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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