CVE-2026-44949 Unauthenticated namespace creation and RBAC injection via rancher-webhook FleetWorkspace mutating webhook
Unauthenticated attackers can create namespaces and inject RBAC rules via the Rancher webhook, leading to privilege escalation and unauthorized data modification.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44949?
CVE-2026-44949 is a high-severity missing authorization vulnerability in SUSE Rancher, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-44949?
How do I fix CVE-2026-44949?
No fix has been published for CVE-2026-44949 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-44949 being exploited?
There is no known exploitation of CVE-2026-44949 in the wild and no public exploit code.
Sources
Also known as GHSA-h83p-cq95-vph4.