CVE-2024-39361

Creating posts with user-defined IDs permitted in CreatePost API

Published Jul 3, 2024 CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Description
Mattermost versions 9.8.0, 9.7.x <= 9.7.4, 9.6.x <= 9.6.2 and 9.5.x <= 9.5.5 fail to prevent users from specifying a RemoteId for their posts which allows an attacker to specify both a remoteId and the post ID, resulting in creating a post with a user-defined post ID. This can cause some broken functionality in the channel or thread with user-defined posts

Remediation

Vendor Solution

Update Mattermost to versions 9.9.0, 9.8.1, 9.7.5, 9.6.3, 9.5.6 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-37918 Mattermost versions 9.8.0, 9.7.x <= 9.7.4, 9.6.x <= 9.6.2 and 9.5.x <= 9.5.5 fail to prevent users from specifying a RemoteId for their posts which allows an attacker to specify both a remoteId and the post ID, resulting in creating a post with a user-defined post ID. This can cause some broken functionality in the channel or thread with user-defined posts
References
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Aug 2, 2024, 4:26 AM
Reserved
Jul 1, 2024, 10:22 AM
Status
Modified
Published
Jul 3, 2024, 9:15 AM
Modified
Jun 17, 2026, 7:41 AM