What’s Vulnerable › Vulnerabilities
CVE-2024-39807: Channel IDs of archived/restored channels leaked via webhook events
- Severity: medium (CVSS 5.3 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: 2024-07-03 · updated 2026-06-17
- Weakness: CWE-200
Description
Mattermost versions 9.5.x <= 9.5.5 and 9.8.0 fail to properly sanitize the recipients of a webhook event which allows an attacker monitoring webhook events to retrieve the channel IDs of archived or restored channels.
Affected products
- Mattermost App Framework: from 9.5.0 before 9.5.6; from 9.8.0 before 9.8.1 — fixed in 9.5.6, 9.8.1
How to fix
Upgrade to a fixed version: Mattermost App Framework 9.5.6, 9.8.1. Check the vendor advisory for mitigations.
References
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