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
Advisories
Source ID Title
EUVD EUVD EUVD-2025-29164 Mattermost makes Use of Weak Hash
Github GHSA Github GHSA GHSA-9p92-x77w-9fw2 Mattermost makes Use of Weak Hash
Fixes

Solution

Update Mattermost to versions 10.11.0, 10.8.4, 10.5.9, 9.11.18, 10.10.2, 10.9.4 or higher.


Workaround

No workaround given by the vendor.

References
History

Wed, 17 Sep 2025 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost
Vendors & Products Mattermost mattermost

Tue, 16 Sep 2025 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost
Mattermost mattermost Server

Mon, 15 Sep 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 15 Sep 2025 10:15:00 +0000

Type Values Removed Values Added
Description 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
Title Weak cache keys lead to post IDOR and link preview poisoning
Weaknesses CWE-328
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-09-15T13:57:49.086Z

Reserved: 2025-08-15T15:34:54.442Z

Link: CVE-2025-9078

cve-icon Vulnrichment

Updated: 2025-09-15T13:53:39.946Z

cve-icon NVD

Status : Analyzed

Published: 2025-09-15T10:15:32.627

Modified: 2025-09-16T15:58:12.830

Link: CVE-2025-9078

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-09-17T10:08:38Z