{"schemaVersion":3,"id":"CVE-2026-105208","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"ZITADEL 4.x before 4.17.3 and 3.x through 3.4.15 protects IdP intent tokens with unauthenticated, malleable encryption, allowing authenticated users to tamper with their own token so it is accepted for another user's external login intent. An attacker who predicts a victim's in-flight intent identifier and wins a timing race can call /v2/idp_intents or /v2/sessions to steal the victim's IdP tokens or hijack their session.","dates":{"published":"2026-10-04T13:10:02.664Z","modified":"2026-10-05T15:43:47.569Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.7,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":8.7,"severity":"high","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.7,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":8.7,"severity":"high","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.7,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00081,"percentile":0.00184,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-05T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00081,"percentile":0.00184}],"last30":[{"date":"2026-10-05T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00081,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00081,"percentile":0.00184}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-649","name":"Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking","description":"The product uses obfuscation or encryption of inputs that should not be mutable by an external actor, but the product does not use integrity checks to detect if those inputs have been modified.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/649.html"}],"affected":[{"vendor":"zitadel","product":"zitadel","name":"zitadel","label":"zitadel","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.17.3","noFixRecorded":false,"fixedIn":null},{"text":"≤ 4.19.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.17.3 | ≤ 4.19.4","eol":null,"hubHref":"/vendor/zitadel/zitadel"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-jh3m-cr2x-qp88","label":"github.com/zitadel/zitadel/security/advisories/GHSA-jh3m-cr2x-qp88","hostname":"github.com","tags":["Vendor Advisory"]},{"url":"https://www.vulncheck.com/advisories/zitadel-before-4.17.3-session-hijacking-via-forgeable-idp-intent-tokens","label":"www.vulncheck.com/advisories/zitadel-before-4.17.3-session-hijacking-via-forgeable-idp-intent-tokens","hostname":"www.vulncheck.com","tags":["Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-04T13:10:02.664Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-05T15:43:47.569Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T05:31:33.814Z","stale":false,"partial":false}}