SUSE Rancher up to 0.16.0 Fleet improper authorization

Summaryinfo

A vulnerability marked as critical has been reported in SUSE Rancher up to 0.12.18/0.13.14/0.14.9/0.15.5/0.16.0. This impacts an unknown function of the component Fleet. This manipulation causes improper authorization. The identification of this vulnerability is CVE-2026-93538. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in SUSE Rancher up to 0.12.18/0.13.14/0.14.9/0.15.5/0.16.0 and classified as critical. Affected by this vulnerability is an unknown code of the component Fleet. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-93538 since 09/18/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/28/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 0.12.19, 0.13.15, 0.14.10, 0.15.6 or 0.16.1 eliminates this vulnerability.

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Productinfo

Vendor

• SUSE

Name

• Rancher

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.12.0
• 0.12.1
• 0.12.2
• 0.12.3
• 0.12.4
• 0.12.5
• 0.12.6
• 0.12.7
• 0.12.8
• 0.12.9
• 0.12.10
• 0.12.11
• 0.12.12
• 0.12.13
• 0.12.14
• 0.12.15
• 0.12.16
• 0.12.17
• 0.12.18
• 0.13
• 0.13.0
• 0.13.1
• 0.13.2
• 0.13.3
• 0.13.4
• 0.13.5
• 0.13.6
• 0.13.7
• 0.13.8
• 0.13.9
• 0.13.10
• 0.13.11
• 0.13.12
• 0.13.13
• 0.13.14
• 0.14
• 0.14.0
• 0.14.1
• 0.14.2
• 0.14.3
• 0.14.4
• 0.14.5
• 0.14.6
• 0.14.7
• 0.14.8
• 0.14.9
• 0.15
• 0.15.0
• 0.15.1
• 0.15.2
• 0.15.3
• 0.15.4
• 0.15.5
• 0.16.0

License

• open-source

Website

• Vendor: https://www.suse.com/

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