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CVE-2026-21391

CRITICALCVSS 9.5/10EPSS 0.45%

Last modified

CVE-2026-21391 is a critical-severity vulnerability rated 9.5/10 on the CVSS scale. 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.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 4.0
9.5/10

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:X/V:X/RE:X/U:X

EPSS Probability
0.45%

37.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
Ping IdentityPingAM8.1.0; >= 8.0.0, <= 8.0.2; >= 7.5.0, <= 7.5.2; >= 7.4.0, <= 7.4.2; >= 7.3.0, <= 7.3.3; >= 7.2.0, <= 7.2.2; >= 7.1.0, <= 7.1.4; >= 7.0.0, <= 7.0.2; < 7.0.0

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-21391?
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.
How severe is CVE-2026-21391?
CVE-2026-21391 has a CVSS score of 9.5/10 (CRITICAL severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.
How do I fix CVE-2026-21391?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST