MEDIUM 6.1 NVD

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 ho

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.

References

https://github.com/rancher/rancher/pull/56616

Published: 2026-09-03 · Source: NVD · Feed updated: 2026-09-03

This medium severity vulnerability with a CVSS score of 6.1 was published on 2026-09-03 via NVD.

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