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Mattermost MattermostWeak cache keys lead to post IDOR and link preview poisoning

Risk 16
Severity
4.3
EPSS
0.02%
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing

1 / 2
Source: MITRE

Remedy

Update Mattermost to versions 10.11.0, 10.8.4, 10.5.9, 9.11.18, 10.10.2, 10.9.4 or higher.
First published (updated )
CVE-2025-9078

Mattermost Mattermost ServerMattermost Server exposes sensitive user credentials during shared channel membership synchronization

Risk 37
Severity
6.5
EPSS
0.04%
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.

Remedy

Update Mattermost to versions 10.11.0, 10.10.2 or higher.
First published (updated )
CVE-2025-9076

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