CVE-2026-93539CWE-306

CVE-2026-93539

Medium · published September 28, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
13.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00233 · 13.4th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-09-28T19:17Z
Affected products (1)
ProductVersionsFixed in
suse/rancher_fleet≥ 0.16.0, < 0.16.20.16.2
References (1)
https://github.com/rancher/fleet/security/advisories/GHSA-8vfv-33cg-g75q · [email protected]
EPSS history
Timeline
  • 30 SEP 03:29Z
    EPSS moved — → 0%
    epss
  • 28 SEP 14:19Z
    Unauthenticated GitRepo Spec Mutation via Fleet Git Webhook Receiver
    cvelistv5