CVE-2024-41926

Malicious remote can claim that a user was synced from another remote

Published Aug 1, 2024 CVSS 3.1 · 2.7 Low EPSS < 1% KEV · Not listed
Description
Mattermost versions 9.9.x <= 9.9.0 and 9.5.x <= 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote.

Remediation

Vendor Solution

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

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-2547 Mattermost versions 9.9.x <= 9.9.0 and 9.5.x <= 9.5.6 fail to validate the source of sync messages and only allow the correct remote IDs, which allows a malicious remote to set arbitrary RemoteId values for synced users and therefore claim that a user was synced from another remote.
Github GHSA Github GHSA GHSA-9fpw-c9x7-cv3j Mattermost allows remote actor to set arbitrary RemoteId values for synced users
References
History
Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost Server
Weaknesses CWE-346
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:9.9.0:*:*:*:*:*:*:*
Vendors & Products Mattermost
Mattermost mattermost Server
Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Aug 1, 2024, 2:32 PM
Reserved
Jul 23, 2024, 6:35 PM
Status
Analyzed
Published
Aug 1, 2024, 3:15 PM
Modified
Jun 17, 2026, 7:48 AM