{"affected":[{"defaultStatus":"unaffected","product":"zipline","source":"CNA: VulnCheck","vendor":"diced","versions":[{"lessThan":"4.6.5","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"4.6.5","versionType":"semver"}]}],"cveId":"CVE-2026-126937","cwes":["CWE-367"],"description":"Zipline before 4.6.5 contains a TOCTOU race condition in the POST /api/setup endpoint that allows unauthenticated attackers to create multiple SUPERADMIN accounts by racing concurrent requests before the firstSetup flag is reset. Attackers can send simultaneous requests with spoofed X-Forwarded-For headers during the argon2 hashing window to gain full administrative control of the instance.","epss":{"date":"2026-11-13","percentile":0.30706,"score":0.00364},"exploits":[],"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":1794585565102,"publishedAt":1794562480499,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/diced/zipline/security/advisories/GHSA-wgjv-p9mm-qw77"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/zipline-before-4.6.5-toctou-race-condition-via-api-setup"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/diced/zipline/security/advisories/GHSA-wgjv-p9mm-qw77"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/zipline-before-4.6.5-toctou-race-condition-via-api-setup"}],"remediation":[],"revision":"da328e83b72418c56854bfcacf6da932d075cff1a67e5bac1a6350b145b4fcee","sources":[{"modifiedAt":1794585565102,"name":"CNA: VulnCheck","retrievedAt":1794586245460,"url":"https://www.cve.org/CVERecord?id=CVE-2026-126937"},{"modifiedAt":1794565080417,"name":"NVD","retrievedAt":1794572226181,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126937"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794586249511,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-126937"}],"ssvc":{"assessedAt":1794584107043,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Zipline before 4.6.5 TOCTOU Race Condition via /api/setup","updatedAt":1794586249511}