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TI-2026-63018 Aliases CVE-2026-93538

Authentication bypass by spoofing in SUSE Rancher

Priority LOW 30CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-290.

Summary

A cross-tenant authorization issue was discovered in SUSE Rancher Fleet. During agent-initiated cluster registration, cluster labels supplied by the registering agent, including labels in the reserved management.cattle.io/ namespace such as the cluster display name label, were applied to the resulting upstream Cluster object. Because Fleet resolves GitRepo and Bundle targets from those cluster labels, a party able to register a cluster into a Fleet workspace namespace shared with other tenants could cause its own cluster to satisfy targeting rules that administrators intended for a different cluster. This affects SUSE Rancher Fleet 0.16 before 0.16.1, 0.15 before 0.15.6, 0.14 before 0.14.10, 0.13 before 0.13.15, 0.12 before 0.12.19 and older versions.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00171 6th percentileScored 2026-11-07
Fix Fixed Rancher (SUSE): 0.16.1, 0.15.6, 0.14.10 +2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SUSERancher0.16.0 to before 0.16.1; 0.15.0 to before 0.15.6; 0.14.0 to before 0.14.10; 0.13.0 to before 0.13.15; 0.12.0 to before 0.12.190.16.1, 0.15.6, 0.14.10, 0.13.15, 0.12.19Patch availableCNA
  • Rancher VendorSUSE Affected 0.16.0 to before 0.16.1; 0.15.0 to before 0.15.6; 0.14.0 to before 0.14.10; 0.13.0 to before 0.13.15; 0.12.0 to before 0.12.19 Fixed in 0.16.1, 0.15.6, 0.14.10, 0.13.15, 0.12.19 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:suse:rancher_fleet:*:*:*:*:*:*:*:*0.12.0 to before 0.12.19; 0.13.0 to before 0.13.15; 0.14.0 to before 0.14.10; 0.15.0 to before 0.15.6; 0.16.0 to before 0.16.1VulnerableSUSE
  • cpe:2.3:a:suse:rancher_fleet:*:*:*:*:*:*:*:* Versions 0.12.0 to before 0.12.19; 0.13.0 to before 0.13.15; 0.14.0 to before 0.14.10; 0.15.0 to before 0.15.6; 0.16.0 to before 0.16.1 Vulnerable ·SUSE

Remediation

  • Fix · CNA Rancher (SUSE) Fixed in 0.16.1, 0.15.6, 0.14.10, 0.13.15, 0.12.19

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-93538

References

Advisory 1

  • TI-2026-32801 Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer CVSS 3.1CRITICAL 9.9
  • TI-2026-29689 Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering CVSS 3.1CRITICAL 9.9
  • TI-2026-60216 Fleet agent copies downstream resources with cluster-admin privileges, allowing… CVSS 3.1HIGH 8.8
  • TI-2026-32804 Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent CVSS 3.1HIGH 8.8
  • TI-2026-32803 SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components CVSS 4.0HIGH 8.3
  • TI-2026-63017 Path traversal in Fleet Helm valuesFiles allows disclosure of files outside the bundle directory CVSS 3.1MEDIUM 6.5
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences