CVE-2017-18912: Github.com/mattermost/mattermost server Mattermost Server Allows An Attacker Vulnerability

HIGH
Advisory Identifier: GHSA-m2ch-x2q7-2284
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CWE-22
Published
Advisory Summary

CVE-2017-18912 is a HIGH mattermost server allows an attacker 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 server allows an attacker to specify a full pathname of a log file. Remediation is available by upgrading affected packages to version 3.7.4-0.20170404171331-0b5c0794fdcb.

CVE-2017-18912 at a Glance

CVE Identifier CVE-2017-18912
GHSA Identifier GHSA-m2ch-x2q7-2284
Severity HIGH
CVSS v3.1 Base Score N/A
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

How to Fix CVE-2017-18912

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: 3.7.4-0.20170404171331-0b5c0794fdcb 
Upgrade github.com/mattermost/mattermost-server to 3.7.4-0.20170404171331-0b5c0794fdcb
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-2017-18912, 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 3.7.4-0.20170404171331-0b5c0794fdcb), 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

An issue was discovered in Mattermost Server before 3.7.5. It allows an attacker to specify a full pathname of a log file.

CVE-2017-18912 Affected Github.com/mattermost/mattermost server Versions

1 component(s)
Fixed Versions:
3.7.4-0.20170404171331-0b5c0794fdcb
Product / Package Ecosystem Affected Versions Fixed Version
github.com/mattermost/mattermost-server
golang/github.com/mattermost/mattermost-server
Go
< 3.7.4-0.20170404171331-0b5c0794fdcb
3.7.4-0.20170404171331-0b5c0794fdcb

References

NVD — CVE-2017-18912 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-18912
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost/commit/0b5c0794fdcbb551c1233dcdfbdf5c7deb585fd6
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

Frequently Asked Questions

What is CVE-2017-18912?
CVE-2017-18912 is a security vulnerability in Github.com/mattermost/mattermost server involving Mattermost Server allows an attacker to specify a full pathname of a log file 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 3.7.4-0.20170404171331-0b5c0794fdcb across affected packages: github.com/mattermost/mattermost-server.
What version fixes CVE-2017-18912?
Upgrading to 3.7.4-0.20170404171331-0b5c0794fdcb (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 3.7.4-0.20170404171331-0b5c0794fdcb. Upgrade your dependency to 3.7.4-0.20170404171331-0b5c0794fdcb or later.
What CWE is associated with CVE-2017-18912?
CVE-2017-18912 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-2017-18912?
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-m2ch-x2q7-2284",
  "modified" : "2026-02-12T15:43:41Z",
  "published" : "2022-05-24T17:21:07Z",
  "aliases" : [ "CVE-2017-18912" ],
  "summary" : "Mattermost Server allows an attacker to specify a full pathname of a log file",
  "details" : "An issue was discovered in Mattermost Server before 3.7.5. It allows an attacker to specify a full pathname of a log file.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.7.4-0.20170404171331-0b5c0794fdcb"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-18912"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost/commit/0b5c0794fdcbb551c1233dcdfbdf5c7deb585fd6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mattermost/mattermost"
  }, {
    "type" : "WEB",
    "url" : "https://mattermost.com/security-updates"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-12T15:43:41Z",
    "nvd_published_at" : "2020-06-19T19:15:00Z"
  }
}