CVE-2026-44945

CRITICAL 9.1

Cross-Cluster Impersonation Confused-Deputy Privilege Escalation

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

A privilege escalation vulnerability exists in Rancher's impersonation middleware (pkg/auth/requests/impersonate.go). An authenticated Rancher user with the default user global role can gain full administrative access to the Rancher control plane and transitively to all downstream clusters it manages. This issue affects Rancher: from 2.11.0 before 2.11.16, from 2.12.0 before 2.12.12, from 2.13.0 before 2.13.8, and from 2.14.0 before 2.14.2.

CWE	CWE-441 CWE-497
Vendor	suse
Product	rancher
Published	Aug 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

SUSE / Rancher

2.11.0 < 2.11.16 2.12.0 < 2.12.12 2.13.0 < 2.13.8 2.14.0 < 2.14.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/rancher/rancher/pull/55983 github.com: https://github.com/rancher/rancher/security/advisories/GHSA-v584-7w32-jwpq bugzilla.suse.com: https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44945

Credits

This vulnerability was discovered and reported by @BenTheCyberOne.