{"id":"CVE-2026-81868","revision":"53e92bf3e1cc47f9a55119a1064e52a9","records":[{"revision":"53e92bf3e1cc47f9a55119a1064e52a9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-81868","aliases":[],"title":"Steeltoe: Header-forwarded client cert lacks proof of private-key possession","description":"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.","state":0,"publishedAt":"2026-09-17T15:36:23.149+00:00","modifiedAt":"2026-09-23T18:46:54.265+00:00","affected":[{"ecosystem":"Vendor product","name":"security-advisories","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"SteeltoeOSS\",\n                    \"product\": \"security-advisories\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.3.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-5mq7-rwhj-4fh9","https://github.com/SteeltoeOSS/Steeltoe/commit/b626ef3d60aaf19c68eeeed5ee81045406c8c6d0","https://github.com/SteeltoeOSS/Steeltoe/releases/tag/4.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-81868","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-81868","identifiers":["CVE-2026-81868"]},"retained":false,"historicalAffected":[]}],"coverage":[]}