CVE-2026-81868: Steeltoeoss Security-Advisories

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. Prior to 4.3.0, Steeltoe.Security.Authorization.Certificate deployments using AddOrgAndSpacePolicies() and UseCertificateAuthorization() trust the public certificate supplied in the X-Client-Cert request header without proving possession of the corresponding private key. Common Cloud Foundry routers do not remove this header from inbound requests. When inbound requests are not restricted to a known trusted proxy source IP, an attacker who obtains the public certificate of an application instance in the target organization or space and can reach the application can spoof X-Client-Cert to bypass the SameOrg and SameSpace policies for the certificate validity period. This issue is fixed in version 4.3.0.

Affected products

• Steeltoeoss Security-Advisories: before 4.3.0 (fixed in 4.3.0)

Published 2026-09-17. Last modified 2026-09-30.