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CVE-2025-9079 — Vulnerability in...

HIGH

Mattermost Path Traversal vulnerability

Published September 19, 2025Updated September 26, 2025Source: osv

Summary

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

Advisory Timeline

  • First published September 19, 2025 (388 days ago).
  • Last revised September 26, 2025 — 7 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20250707221302-a8fa77f107ef or later
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20250707221302-a8fa77f107ef
Go
Update github.com/mattermost/mattermost-server to 10.10.2 or later
go get github.com/mattermost/mattermost-server@v10.10.2
Go
Update github.com/mattermost/mattermost-server to 10.5.9 or later
go get github.com/mattermost/mattermost-server@v10.5.9
Go
Update github.com/mattermost/mattermost-server to 9.11.18 or later
go get github.com/mattermost/mattermost-server@v9.11.18
Go
Update github.com/mattermost/mattermost-server to 10.9.4 or later
go get github.com/mattermost/mattermost-server@v10.9.4
Go
Update github.com/mattermost/mattermost-server to 10.8.4 or later
go get github.com/mattermost/mattermost-server@v10.8.4

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (6)

Affects 1 ecosystem: go (2).

PackageEcosystemAffectedFixed In
github.com/mattermost/mattermost/server/v8
go
All versions8.0.0-20250707221302-a8fa77f107ef
github.com/mattermost/mattermost-server
go
All versions10.10.2
github.com/mattermost/mattermost-server
go
All versions10.5.9
github.com/mattermost/mattermost-server
go
All versions9.11.18
github.com/mattermost/mattermost-server
go
All versions10.9.4
github.com/mattermost/mattermost-server
go
All versions10.8.4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.0 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2025-9079?
Mattermost Path Traversal vulnerability This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.0/10).
How do I check if my project is affected by CVE-2025-9079?
CVE-2025-9079 affects github.com/mattermost/mattermost/server/v8 and github.com/mattermost/mattermost-server. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-9079 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.0

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-qx3f-6vq3-8j8m
GO-2025-3977

Related CVEs

  • CVE-2025-12421
    CRITICAL

    Mattermost fails to to verify the token used during code exchange

  • CVE-2025-4981
    CRITICAL

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  • CVE-2025-58073
    HIGH

    Mattermost has a Missing Authorization vulnerability

  • CVE-2026-6961
    HIGH

    Mattermost doesn't sanitize FileInfo.Name received from federated peers during shared channel file sync

  • CVE-2026-6346
    HIGH

    Mattermost doesn't sanitize sensitive configuration fields before including them in support packet generation

  • CVE-2026-24458
    HIGH

    Mattermost fails to properly handle very long passwords

  • CVE-2025-58075
    HIGH

    Mattermost has a Missing Authorization vulnerability

  • CVE-2026-5740
    HIGH

    Mattermost doesn't properly validate msgpack-encoded WebSocket frames before memory allocation

Check if you're affected

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