CVE-2023-37471Network attack vector

Unauthenticated user impersonation via unsigned SAML responses

Published Jul 20, 2023 · Updated Oct 24, 2024

Improper authentication in OpenAM before 14.7.3 allows remote attackers to impersonate any user through SAMLv1.x SSO responses. SAMLUtils.verifyResponse accepted an unsigned response because signature validity was checked without first requiring a signature, while processResponse verified only responses marked as signed. The SAMLv1.x SSO endpoint must be enabled and reachable; a crafted response can establish a session as any OpenAM user, including an administrator.

CVSS severity9.8
Critical
EPSS probability1.26%
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 OpenAM before 14.7.3 allows remote attackers to impersonate any user through SAMLv1.x SSO responses. SAMLUtils.verifyResponse accepted an unsigned response because signature validity was checked without first requiring a signature, while processResponse verified only responses marked as signed. The SAMLv1.x SSO endpoint must be enabled and reachable; a crafted response can establish a session as any OpenAM user, including an administrator.

The record

CVE
CVE-2023-37471
Published
Jul 20, 2023
Updated
Oct 24, 2024
Vendor
Open Identity Platform
Product
OpenAM
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 24, 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?

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

  1. Affected versionversion=< 14.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Identity Platform · OpenAMversion=< 14.7.3

Published CVSS scores

9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/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.

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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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