CVE-2025-9078 MEDIUM

CVE-2025-9078: Weak cache keys lead to post IDOR and link preview poisoning

Vendor Mattermost
Product Mattermost
Weakness CWE-328 · Weak hash
Published September 15, 2025
Last update September 15, 2025
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

September 15, 2025 CVE published
September 15, 2025 Record updated