{"id":"CVE-2026-106499","title":"Backstage is an open framework for building developer portals","summary":"Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.d…","severity":"medium","cvss":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-532","CWE-538"],"vendor":"linuxfoundation","product":"backstage/plugin-scaffolder-backend","affected":["backstage/plugin-scaffolder-backend < 4.1.0","backstage < 1.54.6"],"patched":["backstage/plugin-scaffolder-backend 4.1.0","backstage 1.54.6"],"published":"2026-10-06","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:16:07.970","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106499","references":[{"url":"https://github.com/backstage/backstage/commit/dc30fae2d96cb1606d36cc40b242f9b9e539bd70","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-mfvq-x7vr-rgqg","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106499"},{"url":"https://github.com/advisories/GHSA-mfvq-x7vr-rgqg"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106499.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-106499"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2547214"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-106499"}],"tags":["nvd","ghsa","npm","cve.org","csaf","vex","red-hat"],"epss":0.0027,"epssPercentile":0.19042,"aliases":["GHSA-mfvq-x7vr-rgqg"],"ecosystem":"npm","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-07T17:45:56.549598Z"},"ingestedAt":"2026-10-06T22:23:15.966Z","slug":"CVE-2026-106499","body":"## Overview\n\nBackstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments 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 and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.\n\n## Affected\n\n- `backstage/plugin-scaffolder-backend < 4.1.0`\n- `backstage < 1.54.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `backstage/plugin-scaffolder-backend 4.1.0`\n- `backstage 1.54.6`\n\n## Package advisory (CVE-2026-106499)\n\nAffected packages:\n\n- `@backstage/plugin-scaffolder-backend < 4.1.0`\n\nPatched in:\n\n- `@backstage/plugin-scaffolder-backend 4.1.0`\n\nSource: https://github.com/advisories/GHSA-mfvq-x7vr-rgqg\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Developer Hub, Self-service automation portal 2 · no fix planned: Red Hat Developer Hub, Self-service automation portal 2 · updated 2026-10-07 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106499.json)","depth":"sunlit","depthScore":27,"depthScoreParts":{"impact":27,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}