---
id: CVE-2026-123538
title: OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation
summary: >-
  OpenAM before 16.1.4 does not verify that a signed SAML 1.x assertion or
  response was signed by the partner named as its issuer, accepting a signature
  from any certificate in OpenAM's keystore. An attacker holding such a private
  key, suc…
severity: medium
cvss: 6.6
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-347
vendor: OpenIdentityPlatform
product: OpenAM
affected:
  - OpenAM < 16.1.4
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T01:37:45.221Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-123538'
references:
  - url: >-
      https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-j56q-q3r3-hg7f
    label: GitHub Security Advisory (GHSA-j56q-q3r3-hg7f)
  - url: >-
      https://www.vulncheck.com/advisories/openam-before-16.1.4-saml-1-x-signature-verification-issuer-impersonation
    label: >-
      VulnCheck Advisory: OpenAM before 16.1.4 SAML 1.x Signature Verification
      Issuer Impersonation
tags:
  - cve.org
ingestedAt: '2026-11-08T02:43:18.681Z'
---

## Overview

OpenAM before 16.1.4 does not verify that a signed SAML 1.x assertion or response was signed by the partner named as its issuer, accepting a signature from any certificate in OpenAM's keystore. An attacker holding such a private key, such as a trusted SAML 1.x partner, can forge assertions claiming another partner's issuer and sign in as that partner's users, including privileged ones.

## Affected

- `OpenAM < 16.1.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.