CVE-2025-9081

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

Published: Sep 19, 2025
Updated: Sep 23, 2025
CVE: CVE-2025-9081
GHSA: GHSA-f72g-52v7-mg3p
Severity: Low
Exploit:

CVSS v3:

Severity: Unknown
Score:
AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CWEs:

CWE-639

OWASP TOP 10:

A5 - Broken Access Control

Affected Software
References

Software	From	Fixed in
github.com/mattermost/mattermost-plugin-boards	-	0.0.0-20250716054606-3f3e3becfe1d
github.com/mattermost/mattermost/server/v8	-	8.0.0-20250721095935-11c36f4d1e44
github.com/mattermost/mattermost-server	10.5.0-rc1	10.5.9
github.com/mattermost/mattermost-server	9.11.0-rc1	9.11.18

https://github.com/mattermost/mattermost-plugin-boards/commit/3f3e3becfe1d66db0d0f4fd235f04afd6e1ec40b
https://github.com/mattermost/mattermost-plugin-boards/pull/114
https://mattermost.com/security-updates
https://pkg.go.dev/vuln/GO-2025-3978

Vulnerability Database

CVE-2025-9081

Deep Security Visibility Without the Complexity