Cross-Tenant Authorization Flaw in SUSE Rancher Fleet
CVE-2026-93538

7.1HIGH

Key Information:

Vendor

Suse
Status
Rancher
Vendor
CVE Published:
28 September 2026

What is CVE-2026-93538?

SUSE Rancher Fleet contains a cross-tenant authorization issue that arises during the agent-initiated cluster registration process. Labels supplied by registering agents, including reserved labels like 'management.cattle.io/', are applied to the upstream Cluster object. This can allow unauthorized parties to register clusters within a shared Fleet workspace namespace, potentially leading to the misapplication of targeting rules intended for different clusters. This vulnerability affects multiple versions of Rancher Fleet, making it crucial for users to remain vigilant.

Affected Version(s)

Rancher 0.16.0 < 0.16.1

Rancher 0.15.0 < 0.15.6

Rancher 0.14.0 < 0.14.10

References

https://github.com/rancher/fleet/security/advisories/GHSA...
vendor-advisory

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

https://github.com/Pig-Tail
.