{"id":"CVE-2026-106557","title":"Backstage is an open framework for building developer portals","summary":"Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-22","CWE-918"],"vendor":"backstage","product":"backstage","affected":["backstage < 1.50.5","backstage >= 1.51.0-next.0, < 1.54.6","plugin-techdocs-node < 1.14.6","plugin-techdocs-node >= 1.15.0, < 1.15.4"],"patched":["@backstage/plugin-techdocs-node 1.15.4"],"published":"2026-10-07","updated":"2026-10-07","sourceUpdated":"2026-10-07T18:17:16.983","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106557","references":[{"url":"https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","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-f7v3-xhm6-w245","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-f7v3-xhm6-w245"}],"tags":["nvd","cve.org","ghsa","npm"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-07T17:47:07.050445Z"},"aliases":["GHSA-f7v3-xhm6-w245"],"ecosystem":"npm","ingestedAt":"2026-10-07T16:38:22.231Z","slug":"CVE-2026-106557","body":"## Overview\n\nBackstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary, potentially exposing backend-host data or internal network resources. This issue is fixed in versions 1.14.6 and 1.15.4 when pymdown-extensions 10.21.3 or later is also used, normally through mkdocs-techdocs-core 1.7.0 or later.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-106557)\n\nAffected packages:\n\n- `@backstage/plugin-techdocs-node < 1.15.4`\n\nPatched in:\n\n- `@backstage/plugin-techdocs-node 1.15.4`\n\nSource: https://github.com/advisories/GHSA-f7v3-xhm6-w245","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}