CVE-2023-2422Public exploitNetwork attack vector

Client impersonation via unchecked certificate-chain members

Published Oct 4, 2023 · Updated Aug 2, 2024

Improper certificate validation in Red Hat Single Sign-On 7.6.3 allows remote authenticated users to impersonate OAuth clients. X509ClientAuthenticator scans every presented certificate for a subject matching client_id, although TLS validates only the first certificate. Exploitation requires a valid client certificate and mTLS-enabled OAuth or OpenID clients; an appended self-signed certificate grants access to another client's data.

CVSS severity7.1
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Red Hat Single Sign-On 7.6.3 allows remote authenticated users to impersonate OAuth clients. X509ClientAuthenticator scans every presented certificate for a subject matching client_id, although TLS validates only the first certificate. Exploitation requires a valid client certificate and mTLS-enabled OAuth or OpenID clients; an appended self-signed certificate grants access to another client's data.

The record

CVE
CVE-2023-2422
Published
Oct 4, 2023
Updated
Aug 2, 2024
Vendor
Red Hat
Product
RHEL-8 based Middleware Containers
Classifications
CWE-295, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Red Hat · RHEL-8 based Middleware ContainersAffected versions are unavailable in this record.
Red Hat · Red Hat Single Sign-OnAffected versions are unavailable in this record.

Published CVSS scores

7.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

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-295Improper Certificate Validation
T1190Exploit Public-Facing Application

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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