CVE-2024-39274

Malicious remote can add users to arbitrary teams and channels

Published Aug 1, 2024 CVSS 3.1 · 8.7 High EPSS < 1% KEV · Not listed
Description
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to properly validate that the channel that comes from the sync message is a shared channel, when shared channels are enabled, which allows a malicious remote to add users to arbitrary teams and channels

Remediation

Vendor Solution

Update Mattermost to versions 9.10.0, 9.9.1, 9.5.7, 9.7.6, 9.8.2 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-2562 Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to properly validate that the channel that comes from the sync message is a shared channel, when shared channels are enabled, which allows a malicious remote to add users to arbitrary teams and channels
Github GHSA Github GHSA GHSA-cmc8-222c-vqp9 Mattermost failed to properly validate that the channel that comes from the sync message is a shared channel
References
History
Type Values Removed Values Added
Weaknesses NVD-CWE-noinfo
Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Aug 2, 2024, 3:10 PM
Reserved
Jul 23, 2024, 6:35 PM
Status
Analyzed
Published
Aug 1, 2024, 3:15 PM
Modified
Jun 17, 2026, 7:41 AM