CVE-2026-93539

Unauthenticated GitRepo Spec Mutation via Fleet Git Webhook Receiver

MEDIUM
5.4
CVSS Score
Published: September 28, 2026 at 02:19 PM UTC
Updated: October 7, 2026 at 05:08 PM UTC
2 products affected across 2 vendorsRancherRancher Fleet

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.16.0 ≤ v < 0.16.20.16.0
Affected range stops below 0.16.2, so it looks safe — our inference, not a vendor statement
0.16.0 ≤ v < 0.16.2

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMsuse
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-306

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