External risk intelligence

PingAM ID Token Claim Override Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.5)

CVE-2026-21391

PingAM is an identity and access management solution. These systems are designed to be internet-facing or edge-reachable to provide authentication and authorization services for applications and users, making them public-facing by design in normal deployment scenarios.

Privilege Escalation

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability has been identified in PingAM related to improper validation that could allow an attacker to set or override authentication token claims. In some configurations, this could lead to an attacker bypassing authentication controls through spoofing, potentially resulting in privilege escalation or impersonation. The primary concern is to confirm if your PingAM instances are configured in a way that makes them vulnerable to this specific attack.

  • Authentication bypass possible via token claims.
  • Impacts core identity and access management.
  • Confirm relevant configurations and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could target PingAM by sending a specially crafted request to its identity and access management system. This request would exploit an issue in how the system validates certain data, allowing the attacker to manipulate or replace critical information within an ID Token. If the PingAM system is configured in a way that is susceptible to this manipulation, it could lead to an attacker bypassing authentication, potentially escalating their privileges or impersonating legitimate users.

  • Network access required.
  • Manipulate ID Token claims.
  • Authentication bypass and impersonation.

Live Threat

Current exploitation, exposure, and threat context

A vulnerability in PingAM could allow an attacker to bypass authentication controls by crafting a request that sets or overrides ID Token claims, potentially leading to privilege escalation or impersonation when specific configurations are met.

  • Authentication bypass and privilege escalation.
  • Crafted requests to spoof ID Token claims.
  • Unauthorized access to protected resources.

Operational Fix

Recommended remediation, mitigation, and detection steps

The PingAM identity and access management solution is likely managed by platform or security teams, potentially with vendor management involvement due to its critical role. The immediate priority is to identify all instances of PingAM, assess their exposure and business criticality, and pinpoint the accountable owner for remediation planning.

  • Confirm PingAM instance ownership.
  • Verify reachability and business criticality.
  • Plan remediation based on risk.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is PingAM and what is it used for?

PingAM is an identity and access management solution that acts as a central hub for controlling who can access applications and services. It handles authentication and authorization, verifying user identities and issuing tokens—such as ID Tokens—that grant permission to protected resources. Organizations deploy it to provide secure, unified login experiences across their digital infrastructure.

What does CWE-290 mean in the context of CVE-2026-21391?

CWE-290 refers to an Authentication Bypass by Spoofing. In this vulnerability, the software fails to properly validate the information inside an ID Token. Because the system trusts the incoming data without sufficient checks, an attacker can manipulate or override claim values. This effectively tricks the software into accepting a fraudulent request as legitimate, granting the attacker unauthorized access or elevated privileges.

How does an attacker trigger this vulnerability?

An attacker triggers this by sending a specially crafted request to the PingAM system. The request exploits the validation failure to modify or replace specific data fields within an ID Token. Note that this flaw is not triggered by standard, well-formed user authentication flows; it requires the successful delivery of a malicious, non-standard request that the system incorrectly processes.

Is my PingAM instance at risk?

According to Halo Surface Signal, PingAM is typically designed to be internet-facing or edge-reachable to serve users and applications. Because it often sits at the perimeter of your network to manage identity, these instances are generally considered exposed to external network traffic. If your specific configuration allows for the insecure processing of ID Token claims, your instance may be vulnerable.

What are the first steps to take regarding this CVE?

Prioritize identifying all PingAM instances within your environment and confirming who owns or manages them. Once mapped, assess which instances are business-critical and how they are configured regarding token validation. Coordinate with your platform or security teams to review official vendor guidance and plan the necessary updates to mitigate the risk of unauthorized access or impersonation.

References