{"id":"CVE-2026-106558","published":"2026-10-07T15:17:15.713","lastModified":"2026-10-13T14:25:12.163","description":"Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-backed documentation source may bypass TechDocs sanitization and cause Python objects to be imported and instantiated in the generator runtime, leading to arbitrary code execution. Earlier fixes in versions 1.14.6 and 1.15.4 did not fully address the supported mapping representation of markdown_extensions. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network access. This issue is fixed in versions 1.14.8, 1.15.6, and 2.0.1.","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-502"],"vendors":["linuxfoundation"],"products":["backstage plugin-techdocs-node","backstage"],"references":[{"url":"https://github.com/backstage/backstage/commit/32723a0fe4e12ed80535fc65d5331765c55aa91b","tags":["Patch"]},{"url":"https://github.com/backstage/backstage/commit/944edb51c8524d3664b18f2d57ba101b1c93b709","tags":["Patch"]},{"url":"https://github.com/backstage/backstage/commit/f18e9abcc6051491862b15e4fc60e69f8d52310c","tags":["Patch"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.7","tags":["Patch","Release Notes"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.9","tags":["Patch","Release Notes"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.55.2","tags":["Patch","Release Notes"]},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-qmw3-745m-w99g","tags":["Mitigation","Vendor Advisory"]}],"exploitRefs":[{"url":"https://github.com/backstage/backstage/commit/32723a0fe4e12ed80535fc65d5331765c55aa91b","tags":["Patch"]},{"url":"https://github.com/backstage/backstage/commit/944edb51c8524d3664b18f2d57ba101b1c93b709","tags":["Patch"]},{"url":"https://github.com/backstage/backstage/commit/f18e9abcc6051491862b15e4fc60e69f8d52310c","tags":["Patch"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.7","tags":["Patch","Release Notes"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.9","tags":["Patch","Release Notes"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.55.2","tags":["Patch","Release Notes"]},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-qmw3-745m-w99g","tags":["Mitigation","Vendor Advisory"]}],"hasPoc":true,"ai":{"summary":"The flaw allows an authenticated attacker to bypass TechDocs sanitization and execute arbitrary code by manipulating the markdown_extensions configuration.","exploitability":"Exploitation requires an authenticated user who can register or influence an SCM-backed documentation source. The attacker must have knowledge of the specific configuration to exploit the vulnerability.","blast_radius":"If exploited, the impact is significant as it could lead to arbitrary code execution, especially if the documentation generation runs with backend credentials, filesystem access, or internal network access.","remediation":"Upgrade to Backstage version 1.14.8, 1.15.6, or 2.0.1.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","auth-bypass","techdocs","backstage","markdown"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-09T08:43:44.809Z"}}