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Vulnerability record · CVE-2026-45793 · published 15 July 2026

CVE-2026-45793: Information exposure vulnerability

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.

7.5 CVSS 3.1 High EPSS 1.0% · top 38.0% CWE-200 · Information exposure Awaiting Analysis
7.5CVSS 3.1 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
9References
15 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
https://github.com/composer/composer/commit/3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039
https://github.com/composer/composer/commit/65e6390c49f1a11cd8b660d81822086db51fe2d1
https://github.com/composer/composer/commit/e66c8fdb7ff5409bd2f358c5f194038e49e93714
https://github.com/composer/composer/pull/12853
https://github.com/composer/composer/pull/12855
https://github.com/composer/composer/releases/tag/1.10.28
https://github.com/composer/composer/releases/tag/2.2.28
https://github.com/composer/composer/releases/tag/2.9.8
https://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2

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Source: NIST National Vulnerability Database (record CVE-2026-45793), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.