{"answers":{"affected":"6 open source packages ship an affected version, including Steeltoe.Security.Authentication.CloudFoundryBase, Steeltoe.Security.Authentication.JwtBearer and Steeltoe.Security.Authentication.OpenIdConnect.","exploited":"There is no known exploitation of CVE-2026-50202 in the wild and no public exploit code.","fix":"Upgrade Steeltoe.Security.Authentication.CloudFoundryBase to 3.4.0 or later.","what":"CVE-2026-50202 is a medium-severity authentication bypass vulnerability in SteeltoeOSS Steeltoe.Security.Authentication.CloudFoundryBase, published on 17 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-50202 and fix it if it is affected.\n\nWhat it is: CVE-2026-50202 is a medium-severity authentication bypass vulnerability in SteeltoeOSS Steeltoe.Security.Authentication.CloudFoundryBase, published on 17 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-50202 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- Steeltoe.Security.Authentication.CloudFoundryBase (NuGet): affected all versions; fixed in 3.4.0\n- Steeltoe.Security.Authentication.CloudFoundryBase (NuGet): affected all versions; fixed in 3.4.0\n- Steeltoe.Security.Authentication.JwtBearer (NuGet): affected all versions; fixed in 4.2.0\n- Steeltoe.Security.Authentication.JwtBearer (NuGet): affected all versions; fixed in 4.2.0\n- Steeltoe.Security.Authentication.OpenIdConnect (NuGet): affected all versions; fixed in 4.2.0\n- Steeltoe.Security.Authentication.OpenIdConnect (NuGet): affected all versions; fixed in 4.2.0\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-2026-50202/ (Markdown: https://insights.sbomify.com/CVE-2026-50202/index.md)","id":"CVE-2026-50202","markdown":"https://insights.sbomify.com/CVE-2026-50202/index.md","name":"CVE-2026-50202","record":{"aliases":["GHSA-7fqc-p256-7pwj"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Steeltoe authentication library","requires_auth":"high_privilege","summary":"Attackers can bypass authentication in multi-scheme apps by exploiting shared JWT key caches that lack authority namespacing and expiration.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-668","name":"Exposure of Resource to Wrong Sphere"}],"description":"Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Security.Authentication.CloudFoundryBase prior to version 3.4.0, Steeltoe.Security.Authentication.JwtBearer prior to version 4.2.0, and Steeltoe.Security.Authentication.OpenIdConnect prior to version 4.2.0, the JWT signing key cache in `TokenKeyResolver` uses `kid` as the sole cache key without namespacing by authority. In applications with multiple `JwtBearer` schemes pointing to different identity providers, a key fetched for one scheme can satisfy token validation for another. Additionally, cached keys have no expiration, so rotated or revoked keys remain trusted until the application process restarts. Steeltoe.Security.Authentication.CloudFoundryBase version 3.4.0, Steeltoe.Security.Authentication.JwtBearer version 4.2.0, and Steeltoe.Security.Authentication.OpenIdConnect version 4.2.0 patch the issue. If an immediate upgrade is not possible: In multi-scheme deployments, configure only one `JwtBearer` scheme per application when different identity providers are required; and/or restart the application process after an identity provider signing key rotation to clear stale cached keys.","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's static JWKS cache shared across schemes and never invalidated","id":"CVE-2026-50202","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"NuGet","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":6,"n_references":3,"next":{"headline":"Apache Airflow SFTP provider: Path traversal in SFTPHook.retrieve_directory","id":"CVE-2026-50203"},"packages":[{"ecosystem":"NuGet","fixed":["3.4.0"],"introduced":["0"],"last_affected":[],"package":"Steeltoe.Security.Authentication.CloudFoundryBase","purl":null,"source":"GHSA-7fqc-p256-7pwj"},{"ecosystem":"NuGet","fixed":["3.4.0"],"introduced":["0"],"last_affected":[],"package":"Steeltoe.Security.Authentication.CloudFoundryBase","purl":"pkg:nuget/Steeltoe.Security.Authentication.CloudFoundryBase","source":"GHSA-7fqc-p256-7pwj"},{"ecosystem":"NuGet","fixed":["4.2.0"],"introduced":["0"],"last_affected":[],"package":"Steeltoe.Security.Authentication.JwtBearer","purl":null,"source":"GHSA-7fqc-p256-7pwj"},{"ecosystem":"NuGet","fixed":["4.2.0"],"introduced":["0"],"last_affected":[],"package":"Steeltoe.Security.Authentication.JwtBearer","purl":"pkg:nuget/Steeltoe.Security.Authentication.JwtBearer","source":"GHSA-7fqc-p256-7pwj"},{"ecosystem":"NuGet","fixed":["4.2.0"],"introduced":["0"],"last_affected":[],"package":"Steeltoe.Security.Authentication.OpenIdConnect","purl":null,"source":"GHSA-7fqc-p256-7pwj"},{"ecosystem":"NuGet","fixed":["4.2.0"],"introduced":["0"],"last_affected":[],"package":"Steeltoe.Security.Authentication.OpenIdConnect","purl":"pkg:nuget/Steeltoe.Security.Authentication.OpenIdConnect","source":"GHSA-7fqc-p256-7pwj"}],"prev":{"headline":"Steeltoe's sensitive actuators (heapdump/env) only require Restricted permission","id":"CVE-2026-50201"},"products":["Steeltoe.Security.Authentication.CloudFoundryBase","Steeltoe.Security.Authentication.JwtBearer","Steeltoe.Security.Authentication.OpenIdConnect"],"published":"2026-06-17","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":"total"},"state":"PUBLISHED","updated":"2026-06-18","vendors":["SteeltoeOSS"]},"summary":"Attackers can bypass authentication in multi-scheme apps by exploiting shared JWT key caches that lack authority namespacing and expiration.","url":"https://insights.sbomify.com/CVE-2026-50202/"}