What’s Vulnerable › Vulnerabilities

CVE-2026-74240: Quay: jwt claim validation bypasses in quay federated robot and sso authentication

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-14 · updated 2026-08-20
• Weakness: CWE-287

Description

A flaw was found in Red Hat Quay's JWT (JSON Web Token) validation for federated robot accounts and single sign-on (SSO) authentication. Multiple issues related to audience verification and the enforcement of `azp` and `sub` claims were identified. These flaws could allow an attacker with a validly-signed token from the same identity provider to bypass configured security restrictions. This bypass could lead to unauthorized access by circumventing intended audience, subject, or authorized-client limitations.

Affected products

• Red Hat OpenShift Update Service: all versions
• Red Hat Quay 3: 3.0.0

References

• https://access.redhat.com/security/cve/CVE-2026-74240
• https://bugzilla.redhat.com/show_bug.cgi?id=2516139

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