Mattermost up to 10.10.1 Plugin path traversal

Summaryinfo

A vulnerability was found in Mattermost up to 9.11.17/10.5.8/10.8.3/10.9.3/10.10.1. It has been rated as critical. The impacted element is an unknown function of the component Plugin Handler. Performing a manipulation results in path traversal. This vulnerability is identified as CVE-2025-9079. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Mattermost up to 9.11.17/10.5.8/10.8.3/10.9.3/10.10.1. This affects an unknown function of the component Plugin Handler. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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

The weakness was released by daw10. The advisory is shared at mattermost.com. This vulnerability is uniquely identified as CVE-2025-9079 since 08/15/2025. The exploitability is told to be difficult. It is possible to initiate the attack remotely. The exploitation needs additional levels of successful authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 9.11.18, 10.5.9, 10.8.4, 10.9.4, 10.10.2 or 10.11.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202509-3165) and EUVD (EUVD-2025-30242). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Groupware Software

Name

• Mattermost

Version

• 9.11.0
• 9.11.1
• 9.11.2
• 9.11.3
• 9.11.4
• 9.11.5
• 9.11.6
• 9.11.7
• 9.11.8
• 9.11.9
• 9.11.10
• 9.11.11
• 9.11.12
• 9.11.13
• 9.11.14
• 9.11.15
• 9.11.16
• 9.11.17
• 10.5.0
• 10.5.1
• 10.5.2
• 10.5.3
• 10.5.4
• 10.5.5
• 10.5.6
• 10.5.7
• 10.5.8
• 10.8.0
• 10.8.1
• 10.8.2
• 10.8.3
• 10.9.0
• 10.9.1
• 10.9.2
• 10.9.3
• 10.10.0
• 10.10.1

License

• open-source

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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