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Mattermost boards plugin fails to restrict download access to files

Low severity GitHub Reviewed Published Sep 19, 2025 to the GitHub Advisory Database • Updated Sep 26, 2025

Package

gomod github.com/mattermost/mattermost-plugin-boards (Go)

Affected versions

< 0.0.0-20250716054606-3f3e3becfe1d

Patched versions

0.0.0-20250716054606-3f3e3becfe1d
gomod github.com/mattermost/mattermost-server (Go)
>= 10.5.0-rc1, < 10.5.9
>= 9.11.0-rc1, < 9.11.18
10.5.9
9.11.18
gomod github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20250721095935-11c36f4d1e44
8.0.0-20250721095935-11c36f4d1e44

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

Published by the National Vulnerability Database Sep 19, 2025
Published to the GitHub Advisory Database Sep 19, 2025
Reviewed Sep 22, 2025
Last updated Sep 26, 2025

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(1st percentile)

Weaknesses

Authorization Bypass Through User-Controlled Key

The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Learn more on MITRE.

CVE ID

CVE-2025-9081

GHSA ID

GHSA-f72g-52v7-mg3p

Source code

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