CVE-2025-9079: Github.com/mattermost/mattermost server Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-qx3f-6vq3-8j8m
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CVSS 8.0
CWE-22
Published
Advisory Summary

CVE-2025-9079 is a HIGH (CVSS 8.0) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Github.com/mattermost/mattermost server libraries in the Go ecosystem. The issue involves mattermost path traversal vulnerability. Remediation is available by upgrading affected packages to version 10.8.4, 10.5.9, 9.11.18, 10.10.2, 10.9.4, 8.0.0-20250707221302-a8fa77f107ef.

CVE-2025-9079 at a Glance

CVE Identifier CVE-2025-9079
GHSA Identifier GHSA-qx3f-6vq3-8j8m
Severity HIGH
CVSS v3.1 Base Score 8.0
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Github.com/mattermost/mattermost server
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 8.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2025-9079

To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/mattermost/mattermost-server fixed: 10.8.4 
Upgrade github.com/mattermost/mattermost-server to 10.8.4
github.com/mattermost/mattermost-server fixed: 10.5.9 
Upgrade github.com/mattermost/mattermost-server to 10.5.9
github.com/mattermost/mattermost-server fixed: 9.11.18 
Upgrade github.com/mattermost/mattermost-server to 9.11.18
github.com/mattermost/mattermost-server fixed: 10.10.2 
Upgrade github.com/mattermost/mattermost-server to 10.10.2
github.com/mattermost/mattermost-server fixed: 10.9.4 
Upgrade github.com/mattermost/mattermost-server to 10.9.4
github.com/mattermost/mattermost/server/v8 fixed: 8.0.0-20250707221302-a8fa77f107ef 
Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250707221302-a8fa77f107ef
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/mattermost/mattermost-server

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-9079, inspect your project dependencies for Github.com/mattermost/mattermost server:

inspect dependencies for github.com/mattermost/mattermost-server

Analyze the terminal output to locate any version of Github.com/mattermost/mattermost server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.8.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where 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. In Github.com/mattermost/mattermost server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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

CVE-2025-9079 Affected Github.com/mattermost/mattermost server Versions

6 component(s)
Fixed Versions:
10.8.410.5.99.11.1810.10.210.9.48.0.0-20250707221302-a8fa77f107ef
Product / Package Ecosystem Affected Versions Fixed Version
github.com/mattermost/mattermost-server
golang/github.com/mattermost/mattermost-server
Go
≥ 10.8.0
< 10.8.4
10.8.4
github.com/mattermost/mattermost-server
golang/github.com/mattermost/mattermost-server
Go
≥ 10.5.0
< 10.5.9
10.5.9
github.com/mattermost/mattermost-server
golang/github.com/mattermost/mattermost-server
Go
≥ 9.11.0
< 9.11.18
9.11.18
github.com/mattermost/mattermost-server
golang/github.com/mattermost/mattermost-server
Go
≥ 10.10.0
< 10.10.2
10.10.2
github.com/mattermost/mattermost-server
golang/github.com/mattermost/mattermost-server
Go
≥ 10.9.0
< 10.9.4
10.9.4
github.com/mattermost/mattermost/server/v8
golang/github.com/mattermost/mattermost/server/v8
Go
< 8.0.0-20250707221302-a8fa77f107ef
8.0.0-20250707221302-a8fa77f107ef

References

NVD — CVE-2025-9079 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-9079
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost/commit/047a2c64071749367fe02d2162f6103a3d31a883
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost/commit/439464883aa16a329c23cd6274c4cca7e88e238f
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost/commit/4ff68eea0a3f3777032d31a1a82f4b1fb492a1ac
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost/commit/96665b9b98a17534fcd515982a2eb26950581e41
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost/commit/a8fa77f107efe83f09a779f8e67cbecf236b0032
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost/commit/b38e2eccda182212a8032539658723c7d87e0b7e
Github.com/mattermost/mattermost server Source Repository REPOSITORY
https://github.com/mattermost/mattermost
Github.com/mattermost/mattermost server Security Information SECURITY
https://mattermost.com/security-updates
pkg.go.dev/vuln/go-2025-3977 WEB
https://pkg.go.dev/vuln/GO-2025-3977

Frequently Asked Questions

What is CVE-2025-9079?
CVE-2025-9079 is a security vulnerability in Github.com/mattermost/mattermost server involving Mattermost Path Traversal vulnerability under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Github.com/mattermost/mattermost server versions are affected?
Affected versions include releases prior to 10.8.4, 10.5.9, 9.11.18, 10.10.2, 10.9.4, 8.0.0-20250707221302-a8fa77f107ef across affected packages: github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8.
What version fixes CVE-2025-9079?
Upgrading to 10.8.4, 10.5.9, 9.11.18, 10.10.2, 10.9.4, 8.0.0-20250707221302-a8fa77f107ef (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/mattermost/mattermost-server affected?
Yes, github.com/mattermost/mattermost-server is affected in releases prior to 10.8.4, 10.5.9, 9.11.18, 10.10.2, 10.9.4. Upgrade your dependency to 10.8.4, 10.5.9, 9.11.18, 10.10.2, 10.9.4 or later.
Is github.com/mattermost/mattermost/server/v8 affected?
Yes, github.com/mattermost/mattermost/server/v8 is affected in releases prior to 8.0.0-20250707221302-a8fa77f107ef. Upgrade your dependency to 8.0.0-20250707221302-a8fa77f107ef or later.
What is the CVSS score of CVE-2025-9079?
CVE-2025-9079 has a CVSS v3.1 base score of 8.0 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2025-9079?
CVE-2025-9079 is classified under CWE-22: 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.).
How can I check Go dependencies for CVE-2025-9079?
Run the dependency tree command: 'inspect dependencies for github.com/mattermost/mattermost-server'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-qx3f-6vq3-8j8m",
  "modified" : "2025-09-26T16:24:11Z",
  "published" : "2025-09-19T21:31:21Z",
  "aliases" : [ "CVE-2025-9079" ],
  "summary" : "Mattermost Path Traversal vulnerability",
  "details" : "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",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
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      }, {
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      } ]
    } ]
  }, {
    "package" : {
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    },
    "ranges" : [ {
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    } ]
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    },
    "ranges" : [ {
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  }, {
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.9.0"
      }, {
        "fixed" : "10.9.4"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost/server/v8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.0.0-20250707221302-a8fa77f107ef"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-9079"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost/commit/047a2c64071749367fe02d2162f6103a3d31a883"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost/commit/439464883aa16a329c23cd6274c4cca7e88e238f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost/commit/4ff68eea0a3f3777032d31a1a82f4b1fb492a1ac"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost/commit/96665b9b98a17534fcd515982a2eb26950581e41"
  }, {
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    "url" : "https://github.com/mattermost/mattermost/commit/a8fa77f107efe83f09a779f8e67cbecf236b0032"
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    "url" : "https://github.com/mattermost/mattermost/commit/b38e2eccda182212a8032539658723c7d87e0b7e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mattermost/mattermost"
  }, {
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    "url" : "https://mattermost.com/security-updates"
  }, {
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    "url" : "https://pkg.go.dev/vuln/GO-2025-3977"
  } ],
  "database_specific" : {
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    "github_reviewed" : true,
    "github_reviewed_at" : "2025-09-19T23:05:09Z",
    "nvd_published_at" : "2025-09-19T20:15:40Z"
  }
}