CVE-2026-45793

Composer: Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs

Published Jul 15, 2026 CVSS 3.1 · 7.5 High EPSS 1.0% KEV · Not listed
Description
Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\IO\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9_]+$ and interpolates rejected tokens into an UnexpectedValueException; GitHub Actions GITHUB_TOKEN values using the ghs_<id>_<base64url-JWT> format can contain -, fail validation, and be disclosed to stderr or CI logs. This issue is fixed in versions 1.10.28, 2.2.28, and 2.9.8.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-f9f8-rm49-7jv2 Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs
History
Type Values Removed Values Added
First Time appeared Getcomposer
Getcomposer composer
Vendors & Products Getcomposer
Getcomposer composer
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\IO\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9_]+$ and interpolates rejected tokens into an UnexpectedValueException; GitHub Actions GITHUB_TOKEN values using the ghs_<id>_<base64url-JWT> format can contain -, fail validation, and be disclosed to stderr or CI logs. This issue is fixed in versions 1.10.28, 2.2.28, and 2.9.8.
Title Composer: Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs
Weaknesses CWE-200
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 15, 2026, 6:11 PM
Reserved
May 13, 2026, 8:19 AM
Status
Awaiting Analysis
Published
Jul 15, 2026, 5:16 PM
Modified
Jul 15, 2026, 8:54 PM