CVE-2023-40545Network attack vector

OAuth client authentication bypass via crafted requests

Published Feb 6, 2024 · Updated Aug 22, 2024

Authentication bypass in Ping Identity PingFederate 11.3.0 through 11.3.2 allows remote authenticated users to bypass OAuth client authentication. Public sources identify crafted requests for clients configured with client_secret_jwt but do not disclose the faulty validation operation. A configured OAuth client and network access to an applicable OAuth endpoint are required, and successful bypass compromises that client's protected OAuth operations.

CVSS severity8.8
High
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authentication bypass in Ping Identity PingFederate 11.3.0 through 11.3.2 allows remote authenticated users to bypass OAuth client authentication. Public sources identify crafted requests for clients configured with client_secret_jwt but do not disclose the faulty validation operation. A configured OAuth client and network access to an applicable OAuth endpoint are required, and successful bypass compromises that client's protected OAuth operations.

The record

CVE
CVE-2023-40545
Published
Feb 6, 2024
Updated
Aug 22, 2024
Vendor
Ping Identity
Product
PingFederate
Classifications
CWE-306, CAPEC-115, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=11.3.0 <=11.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ping Identity · PingFederateversion=11.3.0 <=11.3.2

Published CVSS scores

8.8Ping IdentityCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CAPEC-115Authentication Bypass
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo