CVE-2026-59947CWE-532

Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)

Medium · published July 8, 2026

CVSS v3.1
4.7
EPSS
0%
Percentile
1.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.7 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00120 · 1.7th percentile
Weakness
CWE-532 · Insertion of Sensitive Information into Log File
Published
2026-07-08T19:33Z
EPSS history
Timeline
  • 08 JUL 19:33Z
    Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)
    cvelistv5