{"id":"CVE-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":["GHSA-f9f8-rm49-7jv2"],"modified":"2026-07-17T03:46:45.768814373Z","published":"2026-07-15T16:22:19.418Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45793.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-200"]},"references":[{"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":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45793.json"},{"type":"ADVISORY","url":"https://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45793"},{"type":"FIX","url":"https://github.com/composer/composer/commit/3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039"},{"type":"FIX","url":"https://github.com/composer/composer/commit/65e6390c49f1a11cd8b660d81822086db51fe2d1"},{"type":"FIX","url":"https://github.com/composer/composer/commit/e66c8fdb7ff5409bd2f358c5f194038e49e93714"},{"type":"FIX","url":"https://github.com/composer/composer/pull/12853"},{"type":"FIX","url":"https://github.com/composer/composer/pull/12855"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/composer/composer","events":[{"introduced":"32df3aa8cdbdaa16df9491b5e672e81c87f94c78"},{"introduced":"378b34c5e33c71d194f33e1b73a62ba22148ff13"},{"introduced":"934ee6eed3c3ffd0aeccef7c1d255adcf0752b24"},{"fixed":"8db20864c72cc97be1d803efe10dc84abf533a05"},{"fixed":"5104b27aaa735dcbadc1bd65f5ff1ef3552c543a"},{"fixed":"39ee8baff8e97a1b657bbfcd6a236ff93a5efbb2"},{"fixed":"3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039"},{"fixed":"65e6390c49f1a11cd8b660d81822086db51fe2d1"},{"fixed":"e66c8fdb7ff5409bd2f358c5f194038e49e93714"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"1.0"},{"fixed":"1.10.28"},{"introduced":"2.0.0"},{"fixed":"2.2.28"},{"introduced":"2.3.0"},{"fixed":"2.9.8"}]}}],"versions":["2.9.7","2.9.6","2.9.5","2.9.4","2.9.3","2.9.2","2.9.1","2.9.0","2.9.0-RC1","2.8.9","2.8.8","2.8.7","2.8.6","2.8.5","2.8.4","2.8.3","2.8.2","2.8.1","2.8.0","2.7.9","2.7.8","2.7.7","2.7.6","2.7.5","2.7.4","2.7.3","2.7.2","2.7.1","2.7.0","2.6.5","2.6.4","2.6.3","2.6.2","2.6.1","2.6.0","2.5.2","2.5.1","2.5.0","2.4.1","2.4.0","2.4.0-RC1","2.3.5","2.3.4","2.3.3","2.3.2","2.3.1","2.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45793.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}