CVE-2026-71403
Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | suse |
| Product | rancher |
| Published | Sep 3, 2026 |
| Last Updated | Sep 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
SUSE / Rancher
0 < 2.15.1
References
Credits
Andrej TomΔi