CVE-2026-71403
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Suse Rancher
PublishedSep 3, 2026
First seenSep 3, 2026
How to fix
Update
- suse rancher2.15.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| suse rancher | v < 2.15.1 | 2.15.1 |
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