{"id":"CVE-2026-24408","aliases":["GHSA-hm8f-75xx-w2vr","PYSEC-2026-1924"],"title":"sigstore CSRF possibility in OIDC authentication during signing","summary":"sigstore CSRF possibility in OIDC authentication during signing","severity":"none","cvss":0,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N","vendor":"sigstore","product":"sigstore","ecosystem":"pip","affected":["sigstore < 4.2.0"],"patched":["sigstore 4.2.0"],"published":"2026-01-26","updated":"2026-07-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-hm8f-75xx-w2vr","references":[{"url":"https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vr"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24408"},{"url":"https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aa"},{"url":"https://github.com/sigstore/sigstore-python"},{"url":"https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0"}],"tags":["osv","pip"],"epss":0.00181,"epssPercentile":0.06754,"ingestedAt":"2026-07-08T18:25:50.280Z","slug":"CVE-2026-24408","body":"## Overview\n\n### 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.\n\n## Affected packages\n\n- `sigstore < 4.2.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `sigstore 4.2.0`","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}