projectcapsule up to 0.10.3 authorization

Summaryinfo

A vulnerability described as very critical has been identified in projectcapsule capsule up to 0.10.3. The affected element is an unknown function. Executing a manipulation can lead to authorization. This vulnerability appears as CVE-2025-55205. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in projectcapsule capsule up to 0.10.3 and classified as very critical. This vulnerability affects an unknown code block. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Capsule is a multi-tenancy and policy-based framework for Kubernetes. A namespace label injection vulnerability in Capsule v0.10.3 and earlier allows authenticated tenant users to inject arbitrary labels into system namespaces (kube-system, default, capsule-system), bypassing multi-tenant isolation and potentially accessing cross-tenant resources through TenantResource selectors. This vulnerability enables privilege escalation and violates the fundamental security boundaries that Capsule is designed to enforce. This vulnerability is fixed in 0.10.4.

The advisory is available at github.com. This vulnerability was named CVE-2025-55205 since 08/08/2025. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/18/2025).

Upgrading to version 0.10.4 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• projectcapsule

Name

• capsule

Version

• 0.10.0
• 0.10.1
• 0.10.2
• 0.10.3

Website

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

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