What’s Vulnerable › Vulnerabilities

CVE-2022-23652: Privilege escalation using hop-by-hop Connection header

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-02-22 · updated 2026-06-17
• Weakness: CWE-287

Description

capsule-proxy is a reverse proxy for Capsule Operator which provides multi-tenancy in Kubernetes. In versions prior to 0.2.1 an attacker with a proper authentication mechanism may use a malicious `Connection` header to start a privilege escalation attack towards the Kubernetes API Server. This vulnerability allows for an exploit of the `cluster-admin` Role bound to `capsule-proxy`. There are no known workarounds for this issue.

Affected products

• projectcapsule capsule-proxy: before 0.2.1 — fixed in 0.2.1

How to fix

Upgrade to a fixed version: projectcapsule capsule-proxy 0.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/clastix/capsule-proxy/commit/efe91f68ebf8a9e3d21491dc57da7b8a746415d8
• https://github.com/clastix/capsule-proxy/issues/188
• https://github.com/clastix/capsule-proxy/security/advisories/GHSA-9cwv-cppx-mqjm
• https://github.com/clastix/capsule-proxy/commit/efe91f68ebf8a9e3d21491dc57da7b8a746415d8
• https://github.com/clastix/capsule-proxy/issues/188
• https://github.com/clastix/capsule-proxy/security/advisories/GHSA-9cwv-cppx-mqjm

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