CVE-2026-71403

MediumCVSS 6.1/10Last modified Sep 18, 2026

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-639

Affected software

No affected versions have been published.

Timeline

Published: Sep 3, 2026
Last modified: Sep 18, 2026
NVD status: Analyzed

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