GHSA-mj96-mh85-r574: Buildalon/setup steamcmd Buildalon/setup-steamcmd Leaked Authentication Token Vulnerability

HIGH
Share
CWE-532
Published
Advisory Summary

GHSA-mj96-mh85-r574 is a HIGH buildalon/setup-steamcmd leaked authentication token vulnerability (CWE-532: Insertion of Sensitive Information into Log File) affecting Buildalon/setup steamcmd libraries in the GitHub Actions ecosystem. The issue involves buildalon/setup-steamcmd leaked authentication token in job output logs. Remediation is available by upgrading affected packages to version 1.1.0.

GHSA-mj96-mh85-r574 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-mj96-mh85-r574
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-532: Insertion of Sensitive Information into Log File
Affected Product Buildalon/setup steamcmd
Package Ecosystem GitHub Actions
Published Date
Last Updated

How to Fix GHSA-mj96-mh85-r574

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

buildalon/setup-steamcmd fixed: 1.1.0 
Upgrade buildalon/setup-steamcmd to 1.1.0
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 buildalon/setup-steamcmd

How to Check if You Are Affected

To determine whether your application is affected by GHSA-mj96-mh85-r574, inspect your project dependencies for Buildalon/setup steamcmd:

inspect dependencies for buildalon/setup-steamcmd

Analyze the terminal output to locate any version of Buildalon/setup steamcmd in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.1.0), 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-532: Insertion of Sensitive Information into Log File, where the product writes sensitive information to a log file. In Buildalon/setup steamcmd, 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

### Summary Log output includes authentication token that provides full account access ### Details The post job action prints the contents of `config/config.vdf` which holds the saved authentication token and can be used to sign in on another machine. This means any public use of this action leaves authentication tokes for the associated steam accounts publicly available. Additionally, `userdata/$user_id$/config/localconfig.vdf` contains potentially sensitive information which should not be included in public logs. ### PoC Use the following workflow step ``` steps: - name: Setup SteamCMD uses: buildalon/setup-steamcmd@v1.0.4 - name: Sign into steam shell: bash run: | steamcmd +login ${{ secrets.WORKSHOP_USERNAME }} ${{ secrets.WORKSHOP_PASSWORD }} +quit ``` ### Impact Anyone who has used this workflow action with a steam account is affected and has had valid authentication tokens leaked in the job logs. This is particularly bad for public repositories, as anyone with a GitHub account can access the logs and view the token.

GHSA-mj96-mh85-r574 Affected Buildalon/setup steamcmd Versions

1 component(s)
Fixed Versions:
1.1.0
Product / Package Ecosystem Affected Versions Fixed Version
buildalon/setup-steamcmd
 GitHub Actions
< 1.1.0
1.1.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/buildalon/setup-steamcmd/security/advisories/GHSA-mj96-mh85-r574
Security Fix Commit FIX COMMIT
https://github.com/buildalon/setup-steamcmd/commit/c3301963a182b14fd7a5b4991e6ae91ed39e4a5c
Buildalon/setup steamcmd Source Repository REPOSITORY
https://github.com/buildalon/setup-steamcmd

Frequently Asked Questions

What is GHSA-mj96-mh85-r574?
GHSA-mj96-mh85-r574 is a security vulnerability in Buildalon/setup steamcmd involving buildalon/setup-steamcmd leaked authentication token in job output logs under CWE-532: Insertion of Sensitive Information into Log File.
Which Buildalon/setup steamcmd versions are affected?
Affected versions include releases prior to 1.1.0 across affected packages: buildalon/setup-steamcmd.
What version fixes GHSA-mj96-mh85-r574?
Upgrading to 1.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is buildalon/setup-steamcmd affected?
Yes, buildalon/setup-steamcmd is affected in releases prior to 1.1.0. Upgrade your dependency to 1.1.0 or later.
What CWE is associated with GHSA-mj96-mh85-r574?
GHSA-mj96-mh85-r574 is classified under CWE-532: Insertion of Sensitive Information into Log File (The product writes sensitive information to a log file.).
How can I check GitHub Actions dependencies for GHSA-mj96-mh85-r574?
Run the dependency tree command: 'inspect dependencies for buildalon/setup-steamcmd'. 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-mj96-mh85-r574",
  "modified" : "2025-07-21T19:12:48Z",
  "published" : "2025-07-21T19:12:48Z",
  "aliases" : [ ],
  "summary" : "buildalon/setup-steamcmd leaked authentication token in job output logs",
  "details" : "### Summary\nLog output includes authentication token that provides full account access\n\n### Details\nThe post job action prints the contents of `config/config.vdf` which holds the saved authentication token and can be used to sign in on another machine. This means any public use of this action leaves authentication tokes for the associated steam accounts publicly available. Additionally, `userdata/$user_id$/config/localconfig.vdf` contains potentially sensitive information which should not be included in public logs.\n\n### PoC\nUse the following workflow step\n```\nsteps:\n      - name: Setup SteamCMD\n        uses: buildalon/setup-steamcmd@v1.0.4\n\n      - name: Sign into steam\n        shell: bash\n        run: |\n          steamcmd +login ${{ secrets.WORKSHOP_USERNAME }} ${{ secrets.WORKSHOP_PASSWORD }} +quit\n```\n\n### Impact\nAnyone who has used this workflow action with a steam account is affected and has had valid authentication tokens leaked in the job logs. This is particularly bad for public repositories, as anyone with a GitHub account can access the logs and view the token.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "GitHub Actions",
      "name" : "buildalon/setup-steamcmd"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/buildalon/setup-steamcmd/security/advisories/GHSA-mj96-mh85-r574"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/buildalon/setup-steamcmd/commit/c3301963a182b14fd7a5b4991e6ae91ed39e4a5c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/buildalon/setup-steamcmd"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-532" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-07-21T19:12:48Z",
    "nvd_published_at" : null
  }
}