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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.

在 Rancher Manager 中发现了一个缺陷： 的更新接口未强制保证用户资源中 （用户名）和 （主体标识符列表）字段的不变性。拥有 资源上 权限的用户，可以将任意外部身份提供方的主体（principal）注入到任意账户中。这样一来，当该主体的所有者下次登录时，其登录会话会被绑定到受害者的账户，并继承该账户的角色绑定（RBAC 权限）。 此问题影响 Rancher 2.15.1 之前的版本。

CVSS 6.1 · Medium

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

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

V. Comments for CVE-2026-71403

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