---
id: CVE-2026-21391
title: >-
  An improper validation vulnerability exists within PingAM where a well-crafted
  request allows arbitrary or protected ID Token claims to be set or overridden
summary: >-
  An improper validation vulnerability exists within PingAM where a well-crafted
  request allows arbitrary or protected ID Token claims to be set or overridden.
  In certain configurations this could allow an attacker to bypass
  authentication…
severity: critical
cvss: 9.5
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:N'
cwe:
  - CWE-290
vendor: Ping Identity
product: PingAM
affected:
  - PingAM 8.1.0
  - PingAM >= 8.0.0 <= 8.0.2
  - PingAM >= 7.5.0 <= 7.5.2
  - PingAM >= 7.4.0 <= 7.4.2
  - PingAM >= 7.3.0 <= 7.3.3
  - PingAM >= 7.2.0 <= 7.2.2
  - PingAM >= 7.1.0 <= 7.1.4
  - PingAM >= 7.0.0 <= 7.0.2
  - PingAM < 7.0.0
published: '2026-09-14'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:30:42.730'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21391'
references:
  - url: 'https://support.pingidentity.com/s/article/PingAM-Security-Advisory-202603'
    label: responsible-disclosure@pingidentity.com
tags:
  - nvd
  - cve.org
epss: 0.00446
epssPercentile: 0.38182
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-14T14:24:57.614272Z'
cvssSource: cna
ingestedAt: '2026-09-14T15:23:07.421Z'
---

## Overview

An improper validation vulnerability exists within PingAM where a well-crafted request allows arbitrary or protected ID Token claims to be set or overridden. In certain configurations this could allow an attacker to bypass authentication controls via spoofing leading to privilege escalation or impersonation.

## Remediation

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