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Mattermost Path Traversal vulnerability

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

Package

gomod github.com/mattermost/mattermost-server (Go)

Affected versions

>= 10.8.0, < 10.8.4
>= 10.5.0, < 10.5.9
>= 9.11.0, < 9.11.18
>= 10.10.0, < 10.10.2
>= 10.9.0, < 10.9.4

Patched versions

10.8.4
10.5.9
9.11.18
10.10.2
10.9.4
gomod github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20250707221302-a8fa77f107ef
8.0.0-20250707221302-a8fa77f107ef

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 validate import directory path configuration which allows admin users to execute arbitrary code via malicious plugin upload to prepackaged plugins directory

References

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

Severity

High

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
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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:H/UI:N/S:C/C:H/I:H/A:H

EPSS score

Weaknesses

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Learn more on MITRE.

CVE ID

CVE-2025-9079

GHSA ID

GHSA-qx3f-6vq3-8j8m

Source code

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