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CVE-2026-71403— Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind

Quick assessment

Affected
SUSE Rancher
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SUSE rancher是德国SUSE公司开源的一款一套容器管理平台。 SUSE rancher 2.15.1之前版本存在授权问题漏洞，该漏洞源于/v3/users更新路径未强制执行用户资源username和principalIds字段的不可变性，可能导致拥有users.management.cattle.io更新权限的用户将外部身份提供商主体注入任意账户，从而在下次登录时绑定受害者账户并继承其角色绑定。

CVSS 6.1 · Medium EPSS 0.37% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
SUSE Rancher < 2.15.1 affected
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I. Basic Information for CVE-2026-71403

Vulnerability Information
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Vulnerability Title
Rancher: Identity-field mutation in /v3/users allows account hijack via principal rebind
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
SUSE rancher 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SUSE rancher是德国SUSE公司开源的一款一套容器管理平台。 SUSE rancher 2.15.1之前版本存在授权问题漏洞，该漏洞源于/v3/users更新路径未强制执行用户资源username和principalIds字段的不可变性，可能导致拥有users.management.cattle.io更新权限的用户将外部身份提供商主体注入任意账户，从而在下次登录时绑定受害者账户并继承其角色绑定。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SUSE Rancher 0 ~ 2.15.1 -

II. Public POCs for CVE-2026-71403

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III. Intelligence Information for CVE-2026-71403

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Patches & Fixes for CVE-2026-71403 (1)

Same Patch Batch · SUSE · 2026-09-03 · 6 CVEs total

CVE-2026-71404 8.7 HIGH Rancher: Ownership-less ClusterRole overwrite via attacker-controlled cr-name annotation o
CVE-2026-75033 7.7 HIGH Rancher: Cross-Cluster Secret Leakage via Namespace projectId Annotation Spoofing
CVE-2026-75035 7.7 HIGH Rancher: ext.cattle.io/v1 Token store: cross-user token disclosure via label-selector scop
CVE-2026-75034 7.4 HIGH Rancher: SAML Assertion Replay
CVE-2026-75036 5.3 MEDIUM Fleet: DNS exfiltration via Sprig getHostByName in fleet.yaml Helm template preprocessing

IV. Related Vulnerabilities

Same product: Rancher
Same vendor: SUSE
Same weakness: CWE-639