{"id":"CVE-2026-71403","state":"PUBLISHED","title":"Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind","description":"A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings.\n\n\nThis issue affects Rancher: before 2.15.1.","publishedAt":"2026-09-03T14:45:37.468Z","updatedAt":"2026-09-04T03:55:59.443Z","severity":{"score":6.1,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N","source":"suse"},"assigner":"suse","products":["SUSE Rancher"],"affected":[{"vendor":"SUSE","product":"Rancher","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.15.1","versionType":"semver"}],"repo":"https://github.com/rancher/rancher","modules":["Manager"]}],"references":["https://github.com/rancher/rancher/pull/56616"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71403.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71403","state":"PUBLISHED","datePublished":"2026-09-03T14:45:37.468Z","dateUpdated":"2026-09-04T03:55:59.443Z","assignerShortName":"suse","assignerOrgId":"404e59f5-483d-4b8a-8e7a-e67604dd8afb","dateReserved":"2026-08-06T11:38:54.896Z"},"containers":{"cna":{"title":"Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind","descriptions":[{"lang":"en","value":"A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings.\n\n\nThis issue affects Rancher: before 2.15.1."}],"affected":[{"vendor":"SUSE","product":"Rancher","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.15.1","versionType":"semver"}],"repo":"https://github.com/rancher/rancher","modules":["Manager"]}],"references":[{"url":"https://github.com/rancher/rancher/pull/56616","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":6.1,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639 Authorization bypass through User-Controlled key","type":"CWE"}]}],"providerMetadata":{"shortName":"suse","orgId":"404e59f5-483d-4b8a-8e7a-e67604dd8afb","dateUpdated":"2026-09-03T14:45:37.468Z"},"datePublic":"2026-08-31T14:37:00.000Z","impacts":[{"capecId":"CAPEC-21","descriptions":[{"lang":"en","value":"CAPEC-21 Exploitation of Trusted Identifiers"}]},{"capecId":"CAPEC-151","descriptions":[{"lang":"en","value":"CAPEC-151 Identity Spoofing"}]},{"capecId":"CAPEC-593","descriptions":[{"lang":"en","value":"CAPEC-593 Session Hijacking"}]}],"credits":[{"lang":"en","value":"Andrej Tomči","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-03T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-71403"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-04T03:55:59.443Z"}}]}}}