Red Hat OpenShift Update Service/Quay JWT Validation improper authorization

Summaryinfo

A vulnerability classified as critical has been found in Red Hat OpenShift Update Service and Quay. Affected by this vulnerability is an unknown functionality of the component JWT Validation. The manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-74240. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Red Hat OpenShift Update Service and Quay (version now known) and classified as critical. This issue affects some unknown processing of the component JWT Validation. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2026-74240 since 08/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/15/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Virtualization Software

Vendor

• Red Hat

Name

• OpenShift Update Service
• Quay

License

• open-source

Website

• Vendor: https://www.redhat.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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