---
id: CVE-2023-46254
aliases:
  - GHSA-6758-979h-249x
title: >-
  capsule-proxy service discloses Namespaces of colliding tenants to owners of
  different tenants with the same ServiceAccount name
summary: >-
  capsule-proxy service discloses Namespaces of colliding tenants to owners of
  different tenants with the same ServiceAccount name
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
vendor: projectcapsule
product: github.com/projectcapsule/capsule
ecosystem: go
affected:
  - github.com/projectcapsule/capsule < 0.4.5
  - github.com/projectcapsule/capsule-proxy < 0.4.5
patched:
  - github.com/projectcapsule/capsule 0.4.5
  - github.com/projectcapsule/capsule-proxy 0.4.5
published: '2023-11-07'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:04.088051430Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-6758-979h-249x'
references:
  - url: >-
      https://github.com/projectcapsule/capsule-proxy/security/advisories/GHSA-6758-979h-249x
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-46254'
  - url: >-
      https://github.com/projectcapsule/capsule-proxy/commit/615202f7b02eaec7681336bd63daed1f39ae00c5
  - url: 'https://github.com/projectcapsule/capsule-proxy'
  - url: 'https://github.com/projectcapsule/capsule-proxy/releases/tag/v0.4.5'
tags:
  - osv
  - go
epss: 0.00415
epssPercentile: 0.32993
ingestedAt: '2026-09-12T03:13:01.757Z'
---

## Overview

### Summary

A bug in the RoleBinding reflector used by `capsule-proxy` gives ServiceAccount tenant owners the right to list Namespaces of other tenants backed by the same owner kind and name.

### Details

- Tenant `solar`, owned by a ServiceAccount named `tenant-owner` in the Namespace `solar`
- Tenant `wind`, owned by a ServiceAccount named `tenant-owner` in the Namespace `wind`

> Please, notice the same ServiceAccount name, although in different namespaces.

The Tenant owner `solar` would be able to list the namespaces of the Tenant `wind` and vice-versa, although this is not correct.

The bug introduces an exfiltration vulnerability since allows the listing of Namespace resources of other Tenants, although just in some specific conditions:

1. `capsule-proxy` runs with the `--disable-caching=false` (default value: `false`)
2. Tenant owners are ServiceAccount, with the same resource name, but in different Namespaces.

The CVE doesn't allow any privilege escalation on the outer tenant Namespace-scoped resources, since the Kubernetes RBAC is enforcing this.

## Affected packages

- `github.com/projectcapsule/capsule < 0.4.5`
- `github.com/projectcapsule/capsule-proxy < 0.4.5`

## Remediation

Upgrade to a patched release:

- `github.com/projectcapsule/capsule 0.4.5`
- `github.com/projectcapsule/capsule-proxy 0.4.5`