Description
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration
References (1)
Core 1
Core References
Vendor Advisory
https://mattermost.com/security-updates
Scores
CVSS v3
3.1
EPSS
0.0001
EPSS Percentile
1.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-639
Status
published
Products (4)
mattermost/mattermost
0 - 8.0.0-20250721095935-11c36f4d1e44Go
mattermost/mattermost-plugin-boards
0 - 0.0.0-20250716054606-3f3e3becfe1dGo
mattermost/mattermost-server
10.5.0-rc1 - 10.5.9Go
mattermost/mattermost_server
9.11.0 - 9.11.17
Published
Sep 19, 2025
Tracked Since
Feb 18, 2026