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CVE-2026-93538

Cross-tenant BundleDeployment and Secret disclosure via spoofed cluster labels during agent-initiated registration in Fleet

HIGH
7.1
CVSS Score
Published: September 28, 2026 at 02:10 PM UTC
Updated: October 7, 2026 at 05:13 PM UTC
2 products affected across 2 vendorsRancherRancher Fleet

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Severity
HIGH7.1
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

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

Rancher· Rancher
95%
0.12.0 ≤ v < 0.12.190.13.0 ≤ v < 0.13.150.14.0 ≤ v < 0.14.100.15.0 ≤ v < 0.15.60.16.0 ≤ v < 0.16.10.12.00.13.00.14.00.15.00.16.0
Affected range stops below 0.12.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.13.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.14.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.15.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.16.1, so it looks safe — our inference, not a vendor statement
Rancher Fleet· SUSE
95%
0.12.0 ≤ v < 0.12.190.13.0 ≤ v < 0.13.150.14.0 ≤ v < 0.14.100.15.0 ≤ v < 0.15.60.16.0 ≤ v < 0.16.1
Affected range stops below 0.12.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.13.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.14.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.15.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.16.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://github.com/rancher/fleet/security/advisories/GHSA-h9p5-fp5h-qpqr

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

7.1HIGHsuse
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-290CWE-639

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