{"answers":{"affected":"2 open source packages ship an affected version, including Steeltoe.Security.Authorization.Certificate.","exploited":"There is no known exploitation of CVE-2026-81868 in the wild and no public exploit code.","fix":"Upgrade Steeltoe.Security.Authorization.Certificate to 4.3.0 or later.","what":"CVE-2026-81868 is a medium-severity authentication bypass vulnerability in SteeltoeOSS security-advisories, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-81868 and fix it if it is affected.\n\nWhat it is: CVE-2026-81868 is a medium-severity authentication bypass vulnerability in SteeltoeOSS security-advisories, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-81868 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- Steeltoe.Security.Authorization.Certificate (NuGet): affected all versions; fixed in 4.3.0\n- Steeltoe.Security.Authorization.Certificate (NuGet): affected all versions; fixed in 4.3.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-81868/ (Markdown: https://insights.sbomify.com/CVE-2026-81868/index.md)","id":"CVE-2026-81868","markdown":"https://insights.sbomify.com/CVE-2026-81868/index.md","name":"CVE-2026-81868","record":{"aliases":["GHSA-5mq7-rwhj-4fh9"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Steeltoe security library","requires_auth":"none","summary":"Attackers can spoof client certificates to bypass organization and space authorization policies in Steeltoe applications if trusted proxy restrictions are not configured.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"},{"id":"CWE-288","name":"Authentication Bypass Using an Alternate Path or Channel"}],"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.","ecosystems":["NuGet"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Steeltoe: Header-forwarded client cert lacks proof of private-key possession","id":"CVE-2026-81868","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"NuGet","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation","id":"CVE-2026-81869"},"packages":[{"ecosystem":"NuGet","fixed":["4.3.0"],"introduced":["0"],"last_affected":[],"package":"Steeltoe.Security.Authorization.Certificate","purl":null,"source":"GHSA-5mq7-rwhj-4fh9"},{"ecosystem":"NuGet","fixed":["4.3.0"],"introduced":["0"],"last_affected":[],"package":"Steeltoe.Security.Authorization.Certificate","purl":"pkg:nuget/Steeltoe.Security.Authorization.Certificate","source":"GHSA-5mq7-rwhj-4fh9"}],"prev":{"headline":"Deserialization of Untrusted Data in Application Integration allows Remote Code Execution","id":"CVE-2026-81867"},"products":["security-advisories"],"published":"2026-09-17","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-23","vendors":["SteeltoeOSS"]},"summary":"Attackers can spoof client certificates to bypass organization and space authorization policies in Steeltoe applications if trusted proxy restrictions are not configured.","url":"https://insights.sbomify.com/CVE-2026-81868/"}