{"answers":{"affected":"2 open source packages ship an affected version, including @backstage/plugin-techdocs-node. It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-106509 in the wild and no public exploit code.","fix":"Upgrade @backstage/plugin-techdocs-node to 1.15.4 or later.","what":"CVE-2026-106509 is a high-severity code injection vulnerability in Linuxfoundation Backstage, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-106509 and fix it if it is affected.\n\nWhat it is: CVE-2026-106509 is a high-severity code injection vulnerability in Linuxfoundation Backstage, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-106509 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @backstage/plugin-techdocs-node (npm): affected all versions; fixed in 1.15.4\n- @backstage/plugin-techdocs-node (npm): affected all versions; fixed in 1.15.4\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-106509/ (Markdown: https://insights.sbomify.com/CVE-2026-106509/index.md)","id":"CVE-2026-106509","markdown":"https://insights.sbomify.com/CVE-2026-106509/index.md","name":"CVE-2026-106509","record":{"aliases":["GHSA-8w7q-29mw-gf5c"],"analysis":{"component_type":"developer_tool","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"Backstage TechDocs plugin","requires_auth":"low_privilege","summary":"Attackers with repository write access can execute arbitrary code during documentation builds via malicious MkDocs theme configurations in Backstage TechDocs.","user_interaction":"not_required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"backstage","vendor":"linuxfoundation"},{"product":"backstage_plugin-techdocs-node","vendor":"linuxfoundation"}],"cvss":{"score":7.7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-94","name":"Improper Control of Generation of Code"},{"id":"CWE-1336","name":"Improper Neutralization of Special Elements Used in a Template Engine"}],"description":"Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Backstage: Improper validation of MkDocs theme configuration in TechDocs","id":"CVE-2026-106509","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"linuxfoundation:backstage","products":["linuxfoundation:backstage"],"type":"code_injection","year":"2026"},"n_packages":2,"n_references":5,"next":{"headline":"Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml","id":"CVE-2026-106510"},"packages":[{"ecosystem":"npm","fixed":["1.15.4"],"introduced":["0"],"last_affected":[],"package":"@backstage/plugin-techdocs-node","purl":null,"source":"GHSA-8w7q-29mw-gf5c"},{"ecosystem":"npm","fixed":["1.15.4"],"introduced":["0"],"last_affected":[],"package":"@backstage/plugin-techdocs-node","purl":"pkg:npm/%40backstage/plugin-techdocs-node","source":"GHSA-8w7q-29mw-gf5c"}],"prev":{"headline":"Backstage: Potential file exposure through local TechDocs publisher","id":"CVE-2026-106508"},"products":["backstage","plugin-techdocs-node"],"published":"2026-10-06","related":[{"cvss_score":9.6,"headline":"Backstage: Sensitive information exposure in Scaffolder","id":"CVE-2026-106501","kev_date_added":null,"published":"2026-10-06"},{"cvss_score":8.8,"headline":"Backstage: Improper validation of TechDocs MkDocs configuration","id":"CVE-2026-106558","kev_date_added":null,"published":"2026-10-07"},{"cvss_score":8.8,"headline":"Backstage: Improper input validation in TechDocs MkDocs configuration","id":"CVE-2026-88064","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":8.5,"headline":"Backstage: Improper input validation in Sentry scaffolder actions","id":"CVE-2026-106459","kev_date_added":null,"published":"2026-10-06"},{"cvss_score":8.5,"headline":"Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions","id":"CVE-2026-106486","kev_date_added":null,"published":"2026-10-06"},{"cvss_score":8.5,"headline":"Backstage: Improper task state validation in Scaffolder backend","id":"CVE-2026-106500","kev_date_added":null,"published":"2026-10-06"},{"cvss_score":8.5,"headline":"Path Traversal in @backstage/plugin-scaffolder-backend","id":"CVE-2021-43783","kev_date_added":null,"published":"2021-11-29"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-07","vendors":["@backstage","backstage"]},"summary":"Attackers with repository write access can execute arbitrary code during documentation builds via malicious MkDocs theme configurations in Backstage TechDocs.","url":"https://insights.sbomify.com/CVE-2026-106509/"}