CVE-2026-93539 Unauthenticated GitRepo Spec Mutation via Fleet Git Webhook Receiver
Unauthenticated attackers can modify GitRepo configuration in any namespace if the webhook secret is not configured, bypassing namespace authorization controls.
- 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-2026-93539?
CVE-2026-93539 is a medium-severity missing authorization vulnerability in SUSE Rancher, published on 28 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was discovered in Fleet's Git webhook receiver (the gitjob webhook service). When a webhook secret is not configured, incoming webhook requests are accepted without verification, and processing a request can change the spec.pollingInterval field of a matching GitRepo resource in any namespace. A caller with network access to the webhook service and no Kubernetes credentials can therefore alter GitRepo configuration outside
the namespaces they are authorized for. This only affects SUSE Rancher Fleet 0.16 before 0.16.2, older versions are not affected.
Weakness: CWE-306
Which versions are affected by CVE-2026-93539?
It affects 1 product.
Products include Suse Rancher Fleet.
How do I fix CVE-2026-93539?
No fix has been published for CVE-2026-93539 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-2026-93539 being exploited?
There is no known exploitation of CVE-2026-93539 in the wild and no public exploit code.
Other vulnerabilities in SUSE Rancher
- CVE-2026-44935 Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer
- CVE-2026-41050 Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering
- CVE-2026-88808 Privilege escalation in Rancher
- CVE-2026-44938 Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent
- CVE-2026-44937 SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components
Sources
Also known as GHSA-8vfv-33cg-g75q.