{"id":"CVE-2026-24408","aliases":["GHSA-hm8f-75xx-w2vr","PYSEC-2026-1924"],"url":"https://o3.security/vulnerability/CVE-2026-24408","summary":"sigstore has CSRF possibility in OIDC authentication during signing","details":"### Summary\n\nThe sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery.\n\n### Details\n\n`_OAuthSession` creates a unique \"state\" and sends it as a parameter in the authentication request but the \"state\" in the server response seems not not be cross-checked with this value. \n\nFix should be fairly trivial.\n\n### Impact\n\nThis should be low impact: A man-in-the middle attacker could trick a sigstore-python user into signing something with an identity controlled by the attacker (by returning the response to an authentication request they created). This would be quite confusing but not dangerous.","published":"2026-01-26T22:21:35.047Z","modified":"2026-08-12T03:51:40.879932924Z","cvss":{"score":0,"severity":"NONE","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N"},"epss":{"score":0.00161,"percentile":0.0559,"asOf":"2026-09-04"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"sigstore","fixedVersion":"4.2.0"}],"fix":{"url":"https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aa","label":"sigstore/sigstore-python@5e77497"},"references":[{"type":"WEB","url":"https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24408.json"},{"type":"ADVISORY","url":"https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24408"},{"type":"FIX","url":"https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aa"},{"type":"PACKAGE","url":"https://github.com/sigstore/sigstore-python"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:40.879932924Z"}}