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.


This issue affects Rancher: before 2.15.1.
Published: 2026-09-03
Score: 6.1 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 03 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Suse
Suse rancher
Vendors & Products Suse
Suse rancher

Thu, 03 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 03 Sep 2026 15:00:00 +0000

Type Values Removed Values Added
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. This issue affects Rancher: before 2.15.1.
Title Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: suse

Published:

Updated: 2026-09-03T14:57:00.857Z

Reserved: 2026-08-06T11:38:54.896Z

Link: CVE-2026-71403

cve-icon Vulnrichment

Updated: 2026-09-03T14:56:52.406Z

cve-icon NVD

Status : Received

Published: 2026-09-03T15:17:32.180

Modified: 2026-09-03T15:17:32.180

Link: CVE-2026-71403

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T17:15:06Z

Weaknesses
  • CWE-639

    Authorization Bypass Through User-Controlled Key