CVE-2026-71403

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.

Score
CVSS 3.1 6.1 Medium
Status
Analyzed - meissner@suse.de
Published
2026-09-03
Last modified
2026-09-04
Weaknesses
CWE-639

Affected products

References

 
 
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