{"id":"CVE-2026-81868","title":"Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications","summary":"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 UseCe…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-288","CWE-295"],"vendor":"SteeltoeOSS","product":"security-advisories","affected":["security-advisories < 4.3.0"],"patched":["Steeltoe.Security.Authorization.Certificate 4.3.0"],"published":"2026-09-17","updated":"2026-09-23","sourceUpdated":"2026-09-23T19:19:33.167","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81868","references":[{"url":"https://github.com/SteeltoeOSS/Steeltoe/commit/b626ef3d60aaf19c68eeeed5ee81045406c8c6d0","label":"security-advisories@github.com"},{"url":"https://github.com/SteeltoeOSS/Steeltoe/releases/tag/4.3.0","label":"security-advisories@github.com"},{"url":"https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-5mq7-rwhj-4fh9","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81868"},{"url":"https://github.com/advisories/GHSA-5mq7-rwhj-4fh9"}],"tags":["nvd","cve.org","ghsa","nuget"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-23T18:32:10.341865Z"},"epss":0.0025,"epssPercentile":0.14592,"aliases":["GHSA-5mq7-rwhj-4fh9"],"ecosystem":"nuget","ingestedAt":"2026-09-17T16:21:47.711Z","slug":"CVE-2026-81868","body":"## Overview\n\nSteeltoe 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-81868)\n\nAffected packages:\n\n- `Steeltoe.Security.Authorization.Certificate <= 4.2.0`\n\nPatched in:\n\n- `Steeltoe.Security.Authorization.Certificate 4.3.0`\n\nSource: https://github.com/advisories/GHSA-5mq7-rwhj-4fh9","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}