CVE-2026-45793

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.

• CWE-200

• 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

Published

Jul 15, 2026

Last Modified

Jul 15, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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