CVE-2026-74240 Quay: jwt claim validation bypasses in quay federated robot and sso authentication
Attackers with valid tokens can bypass JWT validation checks in Quay, leading to unauthorized access to federated robot and SSO resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-74240?
CVE-2026-74240 is a medium-severity authentication bypass vulnerability in Red Hat OpenShift Update Service, published on 14 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-74240?
It affects 2 products.
Products include Redhat Openshift Update Service, Redhat Quay.
How do I fix CVE-2026-74240?
No fix has been published for CVE-2026-74240 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-74240 being exploited?
There is no known exploitation of CVE-2026-74240 in the wild and no public exploit code.
Other vulnerabilities in Red Hat OpenShift Update Service
- CVE-2026-74243 Quay: unauthenticated secscan notification endpoint in quay when psk is unset
- CVE-2025-57854 Osus-operator: privilege escalation via excessive /etc/passwd permissions
- CVE-2026-74244 Quay: stripe webhook accepts forged events without signature verification in quay
- CVE-2026-74245 Quay: unauthenticated exported logs download in quay
- CVE-2026-74242 Quay: repository notification uuid idor in quay api
Sources
Also known as GHSA-3vf7-35c7-wgcv.