CVE-2022-23652Public exploitNetwork attack vector

Cluster-admin escalation via unstripped Connection tokens

Published Feb 22, 2022 · Updated Apr 22, 2025

Improper authentication in Project Capsule Capsule Proxy before 0.2.1 allows remote authenticated users to gain cluster-admin access. The impersonation handler forwards untrusted Connection tokens without stripping the named Impersonate-User or Impersonate-Group header, so the upstream API server omits tenant impersonation. A valid Capsule Proxy authentication mechanism is required; successful requests execute with the proxy service account's cluster-admin role.

CVSS severity8.8
High
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Project Capsule Capsule Proxy before 0.2.1 allows remote authenticated users to gain cluster-admin access. The impersonation handler forwards untrusted Connection tokens without stripping the named Impersonate-User or Impersonate-Group header, so the upstream API server omits tenant impersonation. A valid Capsule Proxy authentication mechanism is required; successful requests execute with the proxy service account's cluster-admin role.

The record

CVE
CVE-2022-23652
Published
Feb 22, 2022
Updated
Apr 22, 2025
Vendor
Project Capsule
Product
Capsule Proxy
Classifications
CWE-287, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Project Capsule · Capsule Proxyversion=< 0.2.1

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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