{"cve":"CVE-2023-35926","nvd":{"published":"2023-06-22T14:15:09.607","modified":"2026-06-17T06:05:28.840","status":"Undergoing Analysis","description":"Backstage is an open platform for building developer portals. The Backstage scaffolder-backend plugin uses a templating library that requires sandbox, as it by design allows for code injection. The library used for this sandbox so far has been `vm2`, but in light of several past vulnerabilities and existing vulnerabilities  that may not have a fix, the plugin has switched to using a different sandbox library. A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template YAML definition itself and not by user input data. This is vulnerability is fixed in version 1.15.0 of `@backstage/plugin-scaffolder-backend`.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9},"cwes":["CWE-94"],"references":["https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949a","https://github.com/backstage/backstage/releases/tag/v1.15.0","https://github.com/backstage/backstage/security/advisories/GHSA-wg6p-jmpc-xjmr","https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949a","https://github.com/backstage/backstage/releases/tag/v1.15.0"],"products":["linuxfoundation:backstage"],"source":"nvd","synced_at":"2026-10-19T21:38:30.124994567+00:00"},"epss":{"cve":"CVE-2023-35926","score":0.01888,"percentile":0.79532,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-wg6p-jmpc-xjmr","url":"https://osv.dev/vulnerability/GHSA-wg6p-jmpc-xjmr","summary":"Backstage Scaffolder plugin has insecure sandbox","modified":"2026-09-10T03:50:02.364560847Z","packages":[{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend","ranges":["<1.15.0"],"fixed":["1.15.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}