{"affected":[{"defaultStatus":"unaffected","product":"zipline","source":"CNA: VulnCheck","vendor":"diced","versions":[{"lessThanOrEqual":"4.4.0","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-126952","cwes":["CWE-347"],"description":"Zipline through 4.4.0 contains an authentication bypass vulnerability in the WebAuthn login endpoint that creates sessions for a supplied registered credential ID without verifying the assertion. Attackers who obtain a target's passkey credential ID can impersonate that account without its authenticator, potentially gaining administrative control over SUPERADMIN accounts.","epss":{"date":"2026-11-13","percentile":0.27755,"score":0.00339},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/diced/zipline/security/advisories/GHSA-8g3f-425r-35rq"}],"kev":null,"metrics":[{"score":9.2,"severity":"critical","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":8.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},{"score":9.2,"severity":"critical","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":8.1,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1794595047779,"publishedAt":1794562470285,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/diced/zipline/security/advisories/GHSA-8g3f-425r-35rq"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/zipline-through-4.4.0-webauthn-authentication-bypass-via-passkey-login"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/diced/zipline/security/advisories/GHSA-8g3f-425r-35rq"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/diced/zipline/security/advisories/GHSA-8g3f-425r-35rq"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/zipline-through-4.4.0-webauthn-authentication-bypass-via-passkey-login"}],"remediation":[],"revision":"d908757f4cf1260327780558987684eb8c761c0de674a27049dc2a43c814af12","sources":[{"modifiedAt":1794595047779,"name":"CNA: VulnCheck","retrievedAt":1794597894023,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126952"},{"modifiedAt":1794584724843,"name":"NVD","retrievedAt":1794593943725,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126952"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794597922215,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-126952"}],"ssvc":{"assessedAt":1794594946273,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Zipline through 4.4.0 WebAuthn Authentication Bypass via Passkey Login","updatedAt":1794597922215}