{"answers":{"affected":"2 open source packages ship an affected version, including @backstage/backend-defaults.","exploited":"There is no known exploitation of CVE-2026-106495 in the wild and no public exploit code.","fix":"Upgrade @backstage/backend-defaults to 0.17.8 or later.","what":"CVE-2026-106495 is a medium-severity missing authorization vulnerability in @backstage backend-defaults, published on 12 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-2026-106495 and fix it if it is affected.\n\nWhat it is: CVE-2026-106495 is a medium-severity missing authorization vulnerability in @backstage backend-defaults, published on 12 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-2026-106495 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @backstage/backend-defaults (npm): affected all versions; fixed in 0.17.8\n- @backstage/backend-defaults (npm): affected all versions; fixed in 0.17.8\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-2026-106495/ (Markdown: https://insights.sbomify.com/CVE-2026-106495/index.md)","id":"CVE-2026-106495","markdown":"https://insights.sbomify.com/CVE-2026-106495/index.md","name":"CVE-2026-106495","record":{"aliases":["GHSA-3xr5-8w6c-p5gw"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Backstage developer portal","requires_auth":"low_privilege","summary":"Authenticated users can bypass operator-configured action exclusions in Backstage backend-defaults, invoking restricted actions despite existing downstream authorization checks.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":4.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-284","name":"Improper Access Control"}],"description":"Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper access control in backend action invocation. An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced. This issue is fixed in version 0.17.8.","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 access control in backend action invocation","id":"CVE-2026-106495","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Backstage: Inconsistent enforcement of allowed location types during catalog processing","id":"CVE-2026-106496"},"packages":[{"ecosystem":"npm","fixed":["0.17.8"],"introduced":["0"],"last_affected":[],"package":"@backstage/backend-defaults","purl":null,"source":"GHSA-3xr5-8w6c-p5gw"},{"ecosystem":"npm","fixed":["0.17.8"],"introduced":["0"],"last_affected":[],"package":"@backstage/backend-defaults","purl":"pkg:npm/%40backstage/backend-defaults","source":"GHSA-3xr5-8w6c-p5gw"}],"prev":{"headline":"Backstage: Improper input validation in cloud storage URL readers","id":"CVE-2026-106494"},"products":["backend-defaults","backstage"],"published":"2026-10-12","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":"2026-10-13","vendors":["@backstage","backstage"]},"summary":"Authenticated users can bypass operator-configured action exclusions in Backstage backend-defaults, invoking restricted actions despite existing downstream authorization checks.","url":"https://insights.sbomify.com/CVE-2026-106495/"}