{"id":"CVE-2026-29184","aliases":["EUVD-2026-10144","GHSA-8qp7-fhr9-fw53"],"status":"published","title":"@backstage/plugin-scaffolder-backend: Potential Session Token Exfiltration via Log Redaction Bypass","description":"Backstage is an open framework for building developer portals. Prior to version 3.1.4, a malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs. This issue has been patched in version 3.1.4.","severity":{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00305,"percentile":0.23577,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-532"],"published":"2026-03-05T00:23:51Z","modified":"2026-06-17T10:29:44Z","fixes":[{"ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","fixed_in":["3.1.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.1.3"},{"fixed":"3.1.4"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.4"}]}]}],"products":[{"vendor":"backstage","product":"backstage"},{"vendor":"linuxfoundation","product":"backstage\\/plugin-scaffolder-backend"}],"references":[{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-8qp7-fhr9-fw53","tags":["x_refsource_CONFIRM","Vendor Advisory","web"]},{"url":"https://backstage.io/docs/overview/threat-model","tags":["web"]},{"url":"https://backstage.io/docs/permissions/plugin-authors/01-setup","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29184","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-8qp7-fhr9-fw53"},{"url":"https://github.com/backstage/backstage","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-29184","title":"@backstage/plugin-scaffolder-backend: Potential Session Token Exfiltration via Log Redaction Bypass","description":"Backstage is an open framework for building developer portals. Prior to version 3.1.4, a malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs. This issue has been patched in version 3.1.4.","status":"published","published":"2026-03-07T15:03:18.226Z","modified":"2026-03-09T20:24:16.597Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-532"],"updated_at":"2026-11-02T14:19:56.284359Z"}],"euvd":[{"id":"EUVD-2026-10144","description":"Backstage is an open framework for building developer portals. Prior to version 3.1.4, a malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs. This issue has been patched in version 3.1.4.","status":"published","published":"2026-03-07T15:03:18Z","modified":"2026-03-09T20:24:16Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T19:48:06.014236Z"}],"ghsa":[{"id":"GHSA-8qp7-fhr9-fw53","title":"@backstage/plugin-scaffolder-backend Vulnerable to Potential Session Token Exfiltration via Log Redaction Bypass","description":"### Impact\n\nA malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs.\n\nThe attack requires:\n  - The ability to register a template in the catalog\n  - A victim who executes the malicious template\n\n### Patches\n  Patched in `@backstage/plugin-scaffolder-backend` version 3.1.4\n\n### Workarounds\n  - Implement a custom permission policy that restricts scaffolder.task.read so users can only read their own task logs\n  - Restrict who can register templates in the catalog to trusted users only\n\n### Resources\n  - Backstage Scaffolder permissions documentation: https://backstage.io/docs/permissions/plugin-authors/01-setup/\n  - Backstage Threat Model: https://backstage.io/docs/overview/threat-model/","status":"published","published":"2026-03-05T00:23:51Z","modified":"2026-03-09T15:46:58Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-532"],"updated_at":"2026-11-02T14:39:33.538417Z"}],"nvd":[{"id":"CVE-2026-29184","description":"Backstage is an open framework for building developer portals. Prior to version 3.1.4, a malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs. This issue has been patched in version 3.1.4.","status":"published","published":"2026-03-07T15:15:55.08Z","modified":"2026-06-17T10:29:44.33Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-532"],"updated_at":"2026-11-02T14:12:08.279852Z"}],"osv":[{"id":"GHSA-8qp7-fhr9-fw53","title":"@backstage/plugin-scaffolder-backend Vulnerable to Potential Session Token Exfiltration via Log Redaction Bypass","description":"### Impact\n\nA malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs.\n\nThe attack requires:\n  - The ability to register a template in the catalog\n  - A victim who executes the malicious template\n\n### Patches\n  Patched in `@backstage/plugin-scaffolder-backend` version 3.1.4\n\n### Workarounds\n  - Implement a custom permission policy that restricts scaffolder.task.read so users can only read their own task logs\n  - Restrict who can register templates in the catalog to trusted users only\n\n### Resources\n  - Backstage Scaffolder permissions documentation: https://backstage.io/docs/permissions/plugin-authors/01-setup/\n  - Backstage Threat Model: https://backstage.io/docs/overview/threat-model/","status":"published","published":"2026-03-05T00:23:51Z","modified":"2026-03-09T16:02:10.503918Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-532"],"updated_at":"2026-11-02T15:46:42.78452Z"}]}}