CVE-2022-23505Network attack vector

Authentication bypass using arbitrary IdP assertions

Published Dec 13, 2022 · Updated Apr 23, 2025

Authentication bypass in Auth0 passport-wsfed-saml2 before 4.6.3 allows remote attackers to access WSFed-protected websites. WSFed assertion validation accepts an assertion signed by an arbitrary identity provider, but Auth0 has not disclosed the faulty validation operation. Exploitation requires possession of such a signed assertion; depending on the identity provider, generating one requires no valid user access, while SAML2 remains unaffected.

CVSS severity7.5
High
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Auth0 passport-wsfed-saml2 before 4.6.3 allows remote attackers to access WSFed-protected websites. WSFed assertion validation accepts an assertion signed by an arbitrary identity provider, but Auth0 has not disclosed the faulty validation operation. Exploitation requires possession of such a signed assertion; depending on the identity provider, generating one requires no valid user access, while SAML2 remains unaffected.

The record

CVE
CVE-2022-23505
Published
Dec 13, 2022
Updated
Apr 23, 2025
Vendor
Auth0
Product
passport-wsfed-saml2
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 4.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Auth0 · passport-wsfed-saml2version=< 4.6.3

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
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

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Your stack

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