CVE-2026-44949

Unauthenticated namespace creation and RBAC injection via rancher-webhook FleetWorkspace mutating webhook

State: Published
Severity: 7.0 High
Published: Jun 30, 2026
Updated: Jun 30, 2026
Reserved: May 8, 2026

Description

A Rancher FleetWorkspace admission path allowed side effects to occur in the Rancher webhook handler for versions 0.7.0 up to 0.7.10, 0.8.0 up to 0.8.7, 0.9.0 up to 0.9.6 and 0.10.0 up to 0.10.7. An unauthenticated attacker with network access to the in-cluster rancher-webhook service could submit a crafted admission payload and cause workspace-related Kubernetes objects to be created with attacker-chosen identity data.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N	suse

Weaknesses

CWE-306 Missing authentication for critical function

Affected Products

Product	Versions
RancherSUSE	0.7.0 to before 0.7.10Affected 0.8.0 to before 0.8.7Affected 0.9.0 to before 0.9.6Affected 0.10.0 to before 0.10.7Affected

References

https://github.com/rancher/webhook/security/advisories/GHSA-h83p-cq95-vph4vendor-advisory

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