{"schema":"threatline.record/2","record":{"id":"CVE-2026-106499","aliases":["GHSA-mfvq-x7vr-rgqg"],"summary":"Backstage: Secret-derived values may be exposed in scaffolder task logs","details":"### Impact\n\nDeployments that configure sensitive `scaffolder.defaultEnvironment.secrets` and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted in task logs, exposing those values to users with access to the resulting task logs.\n\n### Patches\n\nPatched in `@backstage/plugin-scaffolder-backend` version `4.1.0`\n\n### Workarounds\n\n- Restrict permission to create or update Template entities to fully trusted parties, as recommended by the Backstage threat model.\n- If that restriction cannot be guaranteed, remove sensitive values from `scaffolder.defaultEnvironment.secrets` until a patched version is available.\n\nNo complete workaround is known that preserves both untrusted template authoring and access to sensitive default-environment secrets.","categories":["Libraries & packages"],"product":"@backstage/plugin-scaffolder-backend","vendor":"backstage","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-mfvq-x7vr-rgqg","source_modified_at":"2026-10-07T17:59:15Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"range":"< 4.1.0"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106499","source_modified_at":"2026-10-07T17:46:09.812Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"backstage","vendor":"backstage","versions":[{"version":"< 1.54.6","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106499","source_modified_at":"2026-10-07T17:46:09.812Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"plugin-scaffolder-backend","vendor":"@backstage","versions":[{"version":"< 4.1.0","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-mfvq-x7vr-rgqg","source_modified_at":"2026-10-07T18:15:10.788059211Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"4.1.0"}],"type":"SEMVER"}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-mfvq-x7vr-rgqg","source_modified_at":"2026-10-07T17:59:15Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"version":"4.1.0"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-mfvq-x7vr-rgqg","source_modified_at":"2026-10-07T18:15:10.788059211Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"version":"4.1.0"}],"cvss":4.9,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00269,"percentile":0.18112,"score_date":"2026-10-23"},"published_at":"2026-10-06T21:25:56.166Z","modified_at":"2026-10-07T18:15:10.788059211Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-mfvq-x7vr-rgqg","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T17:59:15Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-106499","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-07T17:46:09.812Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-mfvq-x7vr-rgqg","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T18:15:10.788059211Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-106499","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/backstage/backstage/security/advisories/GHSA-mfvq-x7vr-rgqg","tags":["x_refsource_CONFIRM"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106499","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/dc30fae2d96cb1606d36cc40b242f9b9e539bd70","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-mfvq-x7vr-rgqg","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-07T17:45:56.549598Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-07T18:15:10.788059211Z","content_hash":"c29dcff29585bc3d330f9fae4521f664f1861b0b774a4e9f57c24c3c7eddb2c0"}}