← Vulnerability feed

Vulnerability record · CVE-2026-21391 · published 14 September 2026

CVE-2026-21391: Authentication bypass by spoofing vulnerability

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.

9.5 CVSS 4.0 Critical EPSS 0.45% · top 63.7% CWE-290 · Authentication bypass by spoofing Awaiting Analysis
9.5CVSS 4.0 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
18 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

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

Track CVE-2026-21391 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.5CVE-2023-50224TP-Link router httpd authentication bypass exposes stored credentialsThe httpd service on affected TP-Link router firmware contains an improper authentication flaw (CWE-290) that lets a network-adjacent attacker bypass…KEVEPSS 16%analysed10.0CVE-2024-54085AMI MegaRAC SPx BMC authentication bypass via Redfish Host InterfaceAMI's SPx BMC implementation contains an authentication bypass reachable remotely through the Redfish Host Interface, classified as CWE-290 (authenti…KEVEPSS 61%analysed9.8CVE-2024-4358Progress Telerik Report Server authentication bypass via spoofingTelerik Report Server 2024 Q1 (10.0.24.305) and earlier on IIS contains an authentication bypass by spoofing (CWE-290). An unauthenticated remote att…KEVEPSS 97%analysed9.8CVE-2022-24112Apache APISIX batch-requests plugin auth bypass enables RCEThe batch-requests plugin in Apache APISIX can be abused to bypass the Admin API IP restriction because a code bug defeats the check that overrides t…KEVEPSS 96%analysed9.8CVE-2022-23131Zabbix Frontend SAML SSO authentication bypass via session spoofingZabbix Frontend fails to verify the user login stored in the session when SAML SSO authentication is enabled, allowing session data to be modified. A…KEVEPSS 96%analysed

Source: NIST National Vulnerability Database (record CVE-2026-21391), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.