projectcapsule Capsule up to 0.13.6 Forbidden List forbidden_list.go ForbiddenListSpec.ExactMatch access control

Summaryinfo

A vulnerability was found in projectcapsule Capsule up to 0.13.6. It has been classified as critical. This affects the function ForbiddenListSpec.ExactMatch of the file pkg/api/forbidden_list.go of the component Forbidden List. This manipulation causes access control. The identification of this vulnerability is CVE-2026-61672. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in projectcapsule Capsule up to 0.13.6. Affected by this vulnerability is the function ForbiddenListSpec.ExactMatch of the file pkg/api/forbidden_list.go of the component Forbidden List. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Capsule is a multi-tenancy and policy-based framework for Kubernetes. Prior to 0.13.7, ForbiddenListSpec.ExactMatch in pkg/api/forbidden_list.go sorts denied metadata keys case-insensitively and then uses sort.SearchStrings, which assumes byte-order sorting. When an administrator's forbidden list mixes capitalized and lowercase keys or otherwise has different case-insensitive and byte ordering, the binary search can return false for a key that is present. An authenticated tenant owner can then pass the missed key through api.ValidateForbidden and bypass configured namespace, Service, or delegated node metadata restrictions, potentially influencing cluster policies, network exposure, or scheduling outside the tenant boundary. Uniformly lowercase lists whose two orderings coincide are not affected. This issue is fixed in version 0.13.7.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-61672 since 07/10/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 0.13.7 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• projectcapsule

Name

• Capsule

Version

• 0.13.0
• 0.13.1
• 0.13.2
• 0.13.3
• 0.13.4
• 0.13.5
• 0.13.6

Website

• Product: https://github.com/projectcapsule/capsule/

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