{"id":"CVE-2023-35926","aliases":["GHSA-wg6p-jmpc-xjmr"],"url":"https://o3.security/vulnerability/CVE-2023-35926","summary":"Insecure sandbox in Backstage Scaffolder plugin","details":"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`.","published":"2023-06-22T13:29:03.361Z","modified":"2026-08-12T03:51:11.460277257Z","cvss":{"score":8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","fixedVersion":"1.15.0"}],"fix":{"url":"https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949a","label":"backstage/backstage@fb73755"},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.15.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35926.json"},{"type":"ADVISORY","url":"https://github.com/backstage/backstage/security/advisories/GHSA-wg6p-jmpc-xjmr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-35926"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949a"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:11.460277257Z"}}