SUSE Rancher up to 2.15.0 User Update username/principalIds privileges management

Summaryinfo

A vulnerability was found in SUSE Rancher up to 2.15.0. It has been rated as problematic. Impacted is an unknown function of the component User Update. The manipulation of the argument username/principalIds leads to privileges management. This vulnerability is uniquely identified as CVE-2026-71403. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in SUSE Rancher up to 2.15.0. It has been rated as problematic. This issue affects an unknown function of the component User Update. The manipulation of the argument username/principalIds with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-71403 since 08/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/03/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 2.15.1 eliminates this vulnerability.

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Productinfo

Vendor

• SUSE

Name

• Rancher

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15.0

License

• open-source

Website

• Vendor: https://www.suse.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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