What’s Vulnerable › Vulnerabilities
CVE-2024-41926: Malicious remote can claim that a user was synced from another remote
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-08-01 · updated 2026-06-17
- Weakness: CWE-284
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.
Affected products
- Mattermost: from 9.5.0 before 9.5.7; 9.9.0 — fixed in 9.5.7
How to fix
Upgrade to a fixed version: Mattermost 9.5.7. Check the vendor advisory for mitigations.
References
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