CVE-2026-21391 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://support.pingidentity.com/s/article/PingAM-Security-Advisory-202603

History

Mon, 14 Sep 2026 11:30:00 +0000

Type	Values Removed	Values Added
Description		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.
Title		Improper Claim Validation in PingAM OIDC Provider
Weaknesses		CWE-290
References		https://support.pingidentity.com/s/article/PingAM-Security-Advisory-202603
Metrics		cvssV4_0 `{'score': 9.5, 'vector': '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'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: Ping Identity

Published: 2026-09-14T11:18:33.045Z

Updated: 2026-09-14T14:25:10.479Z

Reserved: 2026-01-07T15:15:23.421Z

Link: CVE-2026-21391

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-14T12:17:38.810

Modified: 2026-09-14T15:17:04.850

Link: CVE-2026-21391

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-290

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