CVE-2024-5272: Run Details leak to guest via webhook event "custom_playbooks_playbook_run_updated"

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: 2024-05-26 · updated 2026-06-17
Weakness: CWE-284

Description

Mattermost versions 9.5.x <= 9.5.3, 9.6.x <= 9.6.1, 8.1.x <= 8.1.12 fail to restrict the audience of the "custom_playbooks_playbook_run_updated" webhook event, which allows a guest on a channel with a playbook run linked to see all the details of the playbook run when the run is marked by finished.

Affected products

Mattermost: from 8.1.0 before 8.1.13; from 9.5.0 before 9.5.4; from 9.6.0 before 9.6.2 — fixed in 8.1.13, 9.5.4, 9.6.2

How to fix

Upgrade to a fixed version: Mattermost 8.1.13, 9.5.4, 9.6.2. Check the vendor advisory for mitigations.

References

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