CVE-2026-71403: CWE-639 Authorization bypass through User-Controlled key in SUSE Rancher
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.
CVE-2026-71403: CWE-639 Authorization bypass through User-Controlled key in SUSE Rancher
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.
CVSS v3.1
Score 6.1medium
Affected software
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Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- suse
- Date Reserved
- 2026-08-06T11:38:54.896Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9989c7acd9273b49126a09
Added to database: 09/03/2026, 14:52:55 UTC
Last updated: 09/03/2026, 14:52:55 UTC
Views: 1
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