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Exposure of Sensitive Information to an Unauthorized Actor

CVE-2026-45793

Low
0/10

Summary

Composer leaks the full contents of tokens configured as GitHub OAuth tokens if they do not match Composer's expected format for such tokens to stderr. GitHub has introduced a new format for GitHub Actions GITHUB_TOKEN values. These tokens are validated in the same way by Composer on GitHub Actions. The new format including a `-` (hyphen) fails Composer's validation and leads to disclosure of the GITHUB_TOKEN in logs. Issue has been patched in 2.9.8, 2.2.28, 1.10.28.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • NONE

CWE-200 - Information Exposure

An information exposure vulnerability is categorized as an information flow (IF) weakness, which can potentially allow unauthorized access to otherwise classified information in the application, such as confidential personal information (demographics, financials, health records, etc.), business secrets, and the application's internal environment.

References

Advisory Timeline

  • Published