{"id":"CVE-2023-49291","aliases":["GHSA-8v8w-v8xg-79rf"],"url":"https://o3.security/vulnerability/CVE-2023-49291","summary":"Improper Sanitization of Branch Name Leads to Arbitrary Code Injection","details":"tj-actions/branch-names is a Github action to retrieve branch or tag names with support for all events. The `tj-actions/branch-names` GitHub Actions improperly references the `github.event.pull_request.head.ref` and `github.head_ref` context variables within a GitHub Actions `run` step. The head ref variable is the branch name and can be used to execute arbitrary code using a specially crafted branch name. As a result an attacker can use this vulnerability to steal secrets from or abuse `GITHUB_TOKEN` permissions. This vulnerability has been addressed in version 7.0.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.","published":"2023-12-04T23:21:33.367Z","modified":"2026-08-12T03:51:28.797953484Z","cvss":{"score":9.3,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N"},"epss":{"score":0.01448,"percentile":0.72051,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"GitHub Actions","name":"tj-actions/branch-names","fixedVersion":"7.0.7"}],"fix":{"url":"https://github.com/tj-actions/branch-names/commit/4923d1ca41f928c24f1c1b3af9daaadfb71e6337","label":"tj-actions/branch-names@4923d1c"},"references":[{"type":"WEB","url":"https://securitylab.github.com/research/github-actions-untrusted-input"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49291.json"},{"type":"ADVISORY","url":"https://github.com/tj-actions/branch-names/security/advisories/GHSA-8v8w-v8xg-79rf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-49291"},{"type":"FIX","url":"https://github.com/tj-actions/branch-names/commit/4923d1ca41f928c24f1c1b3af9daaadfb71e6337"},{"type":"FIX","url":"https://github.com/tj-actions/branch-names/commit/6c999acf206f5561e19f46301bb310e9e70d8815"},{"type":"FIX","url":"https://github.com/tj-actions/branch-names/commit/726fe9ba5e9da4fcc716223b7994ffd0358af060"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.797953484Z"}}