{"answers":{"affected":"2 open source packages ship an affected version, including @backstage/plugin-auth-backend-module-oidc-provider. It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-106488 in the wild and no public exploit code.","fix":"Upgrade @backstage/plugin-auth-backend-module-oidc-provider to 0.4.20 or later.","what":"CVE-2026-106488 is a high-severity authentication bypass vulnerability in Linuxfoundation Backstage, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-106488 and fix it if it is affected.\n\nWhat it is: CVE-2026-106488 is a high-severity authentication bypass vulnerability in Linuxfoundation Backstage, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-106488 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @backstage/plugin-auth-backend-module-oidc-provider (npm): affected all versions; fixed in 0.4.20\n- @backstage/plugin-auth-backend-module-oidc-provider (npm): affected all versions; fixed in 0.4.20\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-2026-106488/ (Markdown: https://insights.sbomify.com/CVE-2026-106488/index.md)","id":"CVE-2026-106488","markdown":"https://insights.sbomify.com/CVE-2026-106488/index.md","name":"CVE-2026-106488","record":{"aliases":["GHSA-826h-28h9-65hg"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["privilege_escalation","data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"Backstage developer portal","requires_auth":"low_privilege","summary":"Authenticated users can assume other identities via unverified emails in OIDC, gaining unauthorized access and permissions.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"backstage","vendor":"linuxfoundation"},{"product":"backstage\\/plugin-auth-backend-module-oidc-provider","vendor":"linuxfoundation"}],"cvss":{"score":8.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"description":"Backstage is an open framework for building developer portals. Prior to 0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package is affected by improper authentication in the oidc provider. Deployments using OIDC email-based identity resolution with a provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity. This may grant access and permissions associated with that user. No direct availability impact is demonstrated. This issue is fixed in version 0.4.20.","ecosystems":["npm"],"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":"Backstage: Improper authentication in the OIDC provider","id":"CVE-2026-106488","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"linuxfoundation:backstage","products":["linuxfoundation:backstage"],"type":"auth_bypass","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Backstage: Improper authorization enforcement for TechDocs static content","id":"CVE-2026-106489"},"packages":[{"ecosystem":"npm","fixed":["0.4.20"],"introduced":["0"],"last_affected":[],"package":"@backstage/plugin-auth-backend-module-oidc-provider","purl":null,"source":"GHSA-826h-28h9-65hg"},{"ecosystem":"npm","fixed":["0.4.20"],"introduced":["0"],"last_affected":[],"package":"@backstage/plugin-auth-backend-module-oidc-provider","purl":"pkg:npm/%40backstage/plugin-auth-backend-module-oidc-provider","source":"GHSA-826h-28h9-65hg"}],"prev":{"headline":"Backstage: Unsupported catalog cluster authentication mode in kubernetes backend","id":"CVE-2026-106487"},"products":["backstage","plugin-auth-backend-module-oidc-provider"],"published":"2026-10-06","related":[{"cvss_score":9.6,"headline":"Backstage: Sensitive information exposure in Scaffolder","id":"CVE-2026-106501","kev_date_added":null,"published":"2026-10-06"},{"cvss_score":8.8,"headline":"Backstage: Improper validation of TechDocs MkDocs configuration","id":"CVE-2026-106558","kev_date_added":null,"published":"2026-10-07"},{"cvss_score":8.8,"headline":"Backstage: Improper input validation in TechDocs MkDocs configuration","id":"CVE-2026-88064","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":8.5,"headline":"Backstage: Improper input validation in Sentry scaffolder actions","id":"CVE-2026-106459","kev_date_added":null,"published":"2026-10-06"},{"cvss_score":8.5,"headline":"Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions","id":"CVE-2026-106486","kev_date_added":null,"published":"2026-10-06"},{"cvss_score":8.5,"headline":"Backstage: Improper task state validation in Scaffolder backend","id":"CVE-2026-106500","kev_date_added":null,"published":"2026-10-06"},{"cvss_score":8.5,"headline":"Path Traversal in @backstage/plugin-scaffolder-backend","id":"CVE-2021-43783","kev_date_added":null,"published":"2021-11-29"}],"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":"US public information, NVD API terms","name":"NVD"},{"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":"2026-10-07","vendors":["@backstage","backstage"]},"summary":"Authenticated users can assume other identities via unverified emails in OIDC, gaining unauthorized access and permissions.","url":"https://insights.sbomify.com/CVE-2026-106488/"}