Description
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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://github.com/projectcapsule/capsule/security/advisories/GHSA-fcpm-6mxq-m5vv
Scores
CVSS v3
9.0
EPSS
0.0002
EPSS Percentile
6.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-863
Status
published
Products (2)
projectcapsule/capsule
0 - 0.10.4Go
projectcapsule/capsule
< 0.10.4
Published
Aug 18, 2025
Tracked Since
Feb 18, 2026