CVE-2026-59947
Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)
CVSS Score
4.7
EPSS Score
0.1%
EPSS Percentile
1th
Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, when Composer is run with -vvv debug verbosity, it could print a credential embedded in the username slot of a repository or package URL, such as a GitHub Personal Access Token in https://TOKEN@host/, to debug output because AuthHelper, Url::sanitize, and ProcessExecutor did not sanitize username-only URL credentials. This issue is fixed in versions 2.2.29 and 2.10.2.
| CWE | CWE-532 |
| Vendor | composer |
| Product | composer |
| Published | Jul 8, 2026 |
| Last Updated | Jul 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
composer / composer
>= 1.0, < 2.2.29 >= 2.3.0, < 2.10.2
References
github.com: https://github.com/composer/composer/security/advisories/GHSA-g6xq-892h-64w3 github.com: https://github.com/composer/composer/commit/6bd66874ae523ecb69aca5964487a0cdfda03ef8 github.com: https://github.com/composer/composer/commit/8887ad76fbd830cb1861a2b1fd8ead78ed1fa1ec github.com: https://github.com/composer/composer/releases/tag/2.10.2 github.com: https://github.com/composer/composer/releases/tag/2.2.29