{"id":"CVE-2026-88064","published":"2026-09-16T15:18:04.297","lastModified":"2026-09-16T16:17:19.897","description":"Backstage is an open framework for building developer portals. Prior to 1.14.6 and from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by an authenticated user who can register or modify a TechDocs source. Unsafe Python YAML tags, markdown_extensions names and configuration, theme options, and extra_templates values can reach the documentation generator and cause unintended code execution. The resulting impact is limited to the files, credentials, network access, and other resources available to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-20","CWE-1336"],"vendors":[],"products":[],"references":[{"url":"https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29","tags":[]},{"url":"https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb","tags":[]},{"url":"https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26","tags":[]},{"url":"https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9","tags":[]},{"url":"https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":[]},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-292q-8mf5-h6g3","tags":[]}],"exploitRefs":[{"url":"https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29","tags":[]},{"url":"https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb","tags":[]},{"url":"https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26","tags":[]},{"url":"https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9","tags":[]},{"url":"https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","tags":[]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":[]},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-292q-8mf5-h6g3","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows an authenticated user to execute arbitrary code by manipulating the mkdocs.yml configuration, posing a significant security risk.","exploitability":"Exploitation requires an authenticated user with the ability to register or modify a TechDocs source, making it moderately exploitable.","blast_radius":"If exploited, the impact is limited to the files, credentials, and network access available to the TechDocs backend or build container, potentially leading to data breaches or unauthorized access.","remediation":"Upgrade to Backstage version 1.14.6 or 1.15.4.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","auth-bypass","yaml-injection","web","config"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-30T09:10:32.994Z"}}