{"id":"BIT-composer-2026-45793","summary":"Composer: Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs","details":"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_\u003cid\u003e_\u003cbase64url-JWT\u003e 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.","aliases":["CVE-2026-45793","GHSA-f9f8-rm49-7jv2"],"modified":"2026-07-20T21:51:40.862597924Z","published":"2026-07-20T20:36:59.690Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:getcomposer:composer:*:*:*:*:*:php:*:*"]},"references":[{"type":"WEB","url":"https://github.com/composer/composer/commit/3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039"},{"type":"WEB","url":"https://github.com/composer/composer/commit/65e6390c49f1a11cd8b660d81822086db51fe2d1"},{"type":"WEB","url":"https://github.com/composer/composer/commit/e66c8fdb7ff5409bd2f358c5f194038e49e93714"},{"type":"WEB","url":"https://github.com/composer/composer/pull/12853"},{"type":"WEB","url":"https://github.com/composer/composer/pull/12855"},{"type":"WEB","url":"https://github.com/composer/composer/releases/tag/1.10.28"},{"type":"WEB","url":"https://github.com/composer/composer/releases/tag/2.2.28"},{"type":"WEB","url":"https://github.com/composer/composer/releases/tag/2.9.8"},{"type":"WEB","url":"https://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45793"}],"affected":[{"package":{"name":"composer","ecosystem":"Bitnami","purl":"pkg:bitnami/composer"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"1.10.28"},{"introduced":"2.0.0"},{"fixed":"2.2.28"},{"introduced":"2.3.0"},{"fixed":"2.9.8"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/composer/BIT-composer-2026-45793.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}],"schema_version":"1.7.5"}