Auth bypass in SUSE Rancher
CVE-2026-93539
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/rancher/fleet/security/advisories/GHSA-8vfv-33cg-g75q (vendor-advisory)
Frequently asked questions
- What is CVE-2026-93539?
- CVE-2026-93539 is a medium-severity vulnerability in SUSE Rancher, classified under Missing Authentication for Critical Function. CVSS score: 5.4/10. Published 2026-09-28.
- How severe is CVE-2026-93539?
- Medium severity. CVSS v3 base score is 5.4 out of 10.