CVE-2026-88810
Privilege escalation in downstream clusters via GlobalRole inheritedNamespacedRules
A privilege escalation issue was discovered in Rancher Manager's role-based access control. The inheritedNamespacedRules field of a GlobalRole propagates permissions into named namespaces of every downstream cluster managed by the Rancher instance, but it was not subject to the privilege-escalation validation applied to the other permission-carrying fields of a GlobalRole. As a result, a non-administrative user could be granted, through a global role binding, permissions in downstream clusters that exceed the permissions that user already holds. This affected SUSE Rancher 2.15.2 only, and SUSE Rancher Webhook 0.11.0 up to 0.11.4, and 0.12.0 up to 0.12.1.
Fixes and workarounds
Fix
github.com/rancher/webhook (go): GitHub reports patched versions 0.11.4. Check the advisory for the affected release branch.
Source: GitHub GHSA-f898-2c8h-r7jcFix
github.com/rancher/webhook (go): GitHub reports patched versions 0.12.1. Check the advisory for the affected release branch.
Source: GitHub GHSA-f898-2c8h-r7jcAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Rancher SUSE Rancher
|
≥ 2.15.2; < 2.15.3 (affected, semver)
Other versions: unaffected |
CNA: suse |
| Rancher SUSE Webhook
|
≥ 0.11.0; < 0.11.4 (affected, semver) ≥ 0.12.0; < 0.12.1 (affected, semver) Other versions: unaffected |
CNA: suse |
github.com/rancher/webhookgithub.com/rancher/webhook
go |
>=0.11.0, <0.11.4 (affected, GitHub advisory range) | GitHub GHSA-f898-2c8h-r7jc |
github.com/rancher/webhookgithub.com/rancher/webhook
go |
>=0.12.0, <0.12.1 (affected, GitHub advisory range) | GitHub GHSA-f898-2c8h-r7jc |
github.com/rancher/ranchergithub.com/rancher/rancher
go |
>=2.15.2 (affected, GitHub advisory range) | GitHub GHSA-f898-2c8h-r7jc |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.2 high |
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H | CNA: suse |
| 3.1 / 7.2 high |
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/rancher/webhook/security/advisories/GHSA-f898-2c8h-r7jcCNA: suse · vendor-advisory
- https://github.com/rancher/webhook/security/advisories/GHSA-f898-2c8h-r7jc[email protected]
- https://github.com/rancher/webhook/security/advisories/GHSA-f898-2c8h-r7jcGitHub Security Advisories · advisory
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