{"id":"CVE-2026-24046","aliases":["EUVD-2026-4137","GHSA-rq6q-wr2q-7pgp","ROOT-APP-NPM-CVE-2026-24046"],"status":"published","title":"Backstage has a Possible Symlink Path Traversal in Scaffolder Actions","description":"Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00525,"percentile":0.44994,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-22","CWE-59"],"published":"2026-01-21T22:36:30Z","modified":"2026-10-28T02:31:13Z","exploits":[{"source":"pocgithub","id":"Rem1L/cve-2026-24046-poc","title":"Rem1L/cve-2026-24046-poc","date":"2026-10-09","url":"https://github.com/Rem1L/cve-2026-24046-poc"}],"fixes":[{"ecosystem":"npm","package":"@backstage/backend-defaults","fixed_in":["0.12.2","0.13.2","0.14.1"],"sources":["ghsa","osv"]},{"ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","fixed_in":["2.2.2","3.0.2","3.1.1"],"sources":["ghsa","osv"]},{"ecosystem":"npm","package":"@backstage/plugin-scaffolder-node","fixed_in":["0.11.2","0.12.3"],"sources":["ghsa","osv"]},{"ecosystem":"Root:npm","package":"@rootio/backstage__backend-defaults","fixed_in":["0.11.1-root.io.1","0.11.1-root.io.2"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@backstage/backend-defaults","fixed_in":["0.11.1-aikido.1","0.11.1-aikido.2"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@backstage/backend-defaults","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.12.2"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/backend-defaults","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.13.0"},{"fixed":"0.13.2"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/backend-defaults","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.14.0"},{"fixed":"0.14.1"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.2"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.0.2"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.0"},{"fixed":"3.1.1"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-node","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.2"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@backstage/plugin-scaffolder-node","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.12.0"},{"fixed":"0.12.3"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/backend-defaults","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.12.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/backend-defaults","ranges":[{"type":"SEMVER","events":[{"introduced":"0.13.0"},{"fixed":"0.13.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/backend-defaults","ranges":[{"type":"SEMVER","events":[{"introduced":"0.14.0"},{"fixed":"0.14.1"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.2.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.0.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"introduced":"3.1.0"},{"fixed":"3.1.1"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-node","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.11.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@backstage/plugin-scaffolder-node","ranges":[{"type":"SEMVER","events":[{"introduced":"0.12.0"},{"fixed":"0.12.3"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"@rootio/backstage__backend-defaults","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.1-root.io.1"},{"fixed":"0.11.1-root.io.2"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"@backstage/backend-defaults","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.1-aikido.1"},{"fixed":"0.11.1-aikido.2"}]}]}],"products":[{"vendor":"backstage","product":"backstage"},{"vendor":"red hat","product":"red hat developer hub 1.8"},{"vendor":"red hat","product":"red hat developer hub 1.9"}],"references":[{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-rq6q-wr2q-7pgp","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/backstage/backstage/commit/c641c147ab371a9a8a2f5f67fdb7cb9c97ef345d","tags":["x_refsource_MISC","fix","web"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-24046","tags":["vdb-entry","x_refsource_REDHAT","advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2431878","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24046.json","tags":["x_sadp-csaf-vex","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:6174","tags":["vendor-advisory","x_refsource_REDHAT","advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:6802","tags":["vendor-advisory","x_refsource_REDHAT","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24046","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-rq6q-wr2q-7pgp"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24046.json","tags":["advisory"]},{"url":"https://github.com/backstage/backstage","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-24046","title":"Backstage has a Possible Symlink Path Traversal in Scaffolder Actions","description":"Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access.","status":"published","published":"2026-01-21T22:36:30.794Z","modified":"2026-07-15T01:17:34.92Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L","level":"high","assessor":"cna"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","level":"critical","assessor":"adp"}],"cwes":["CWE-22","CWE-59","CWE-59"],"updated_at":"2026-11-02T14:19:50.24628Z"}],"euvd":[{"id":"EUVD-2026-4137","description":"Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access.","status":"published","published":"2026-01-21T22:36:30Z","modified":"2026-07-15T01:17:34Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","level":"critical"}],"updated_at":"2026-11-02T18:19:55.318488Z"}],"ghsa":[{"id":"GHSA-rq6q-wr2q-7pgp","title":"Backstage has a Possible Symlink Path Traversal in Scaffolder Actions","description":"### Impact\n\nMultiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to:\n\n1. **Read arbitrary files** via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets)\n2. **Delete arbitrary files** via the `fs:delete` action by creating symlinks pointing outside the workspace\n3. **Write files outside the workspace** via archive extraction (tar/zip) containing malicious symlinks\n\nThis affects any Backstage deployment where users can create or execute Scaffolder templates.\n\n### Patches\n\nThis vulnerability is fixed in the following package versions:\n\n- `@backstage/backend-defaults` version 0.12.2, 0.13.2, 0.14.1, 0.15.0\n- `@backstage/plugin-scaffolder-backend` version 2.2.2, 3.0.2, 3.1.1\n- `@backstage/plugin-scaffolder-node` version 0.11.2, 0.12.3\n\nUsers should upgrade to these versions or later.\n\n### Workarounds\n\n- Follow the recommendation in the [Backstage Threat Model](https://backstage.io/docs/overview/threat-model#scaffolder) to limit access to creating and updating templates\n- Restrict who can create and execute Scaffolder templates using the permissions framework\n- Audit existing templates for symlink usage\n- Run Backstage in a containerized environment with limited filesystem access\n\n### References\n\n- [CWE-59: Improper Link Resolution Before File Access](https://cwe.mitre.org/data/definitions/59.html)\n- [OWASP Path Traversal](https://owasp.org/www-community/attacks/Path_Traversal)","status":"published","published":"2026-01-21T22:36:36Z","modified":"2026-01-22T15:41:20Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L","level":"high"}],"cwes":["CWE-22","CWE-59"],"updated_at":"2026-11-02T14:39:18.564331Z"}],"nvd":[{"id":"CVE-2026-24046","description":"Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access.","status":"published","published":"2026-01-21T23:15:53.24Z","modified":"2026-07-15T02:18:47.13Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L","level":"high","assessor":"secondary"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","level":"critical","assessor":"secondary"}],"cwes":["CWE-22","CWE-59"],"updated_at":"2026-11-02T14:12:04.423757Z"}],"osv":[{"id":"CVE-2026-24046","title":"Backstage has a Possible Symlink Path Traversal in Scaffolder Actions","description":"Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access.","status":"published","published":"2026-01-21T22:36:30.794Z","modified":"2026-10-28T02:31:13.339279815Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L","level":"high"}],"cwes":["CWE-22","CWE-59"],"updated_at":"2026-11-02T15:44:59.079784Z"},{"id":"GHSA-rq6q-wr2q-7pgp","title":"Backstage has a Possible Symlink Path Traversal in Scaffolder Actions","description":"### Impact\n\nMultiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to:\n\n1. **Read arbitrary files** via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets)\n2. **Delete arbitrary files** via the `fs:delete` action by creating symlinks pointing outside the workspace\n3. **Write files outside the workspace** via archive extraction (tar/zip) containing malicious symlinks\n\nThis affects any Backstage deployment where users can create or execute Scaffolder templates.\n\n### Patches\n\nThis vulnerability is fixed in the following package versions:\n\n- `@backstage/backend-defaults` version 0.12.2, 0.13.2, 0.14.1, 0.15.0\n- `@backstage/plugin-scaffolder-backend` version 2.2.2, 3.0.2, 3.1.1\n- `@backstage/plugin-scaffolder-node` version 0.11.2, 0.12.3\n\nUsers should upgrade to these versions or later.\n\n### Workarounds\n\n- Follow the recommendation in the [Backstage Threat Model](https://backstage.io/docs/overview/threat-model#scaffolder) to limit access to creating and updating templates\n- Restrict who can create and execute Scaffolder templates using the permissions framework\n- Audit existing templates for symlink usage\n- Run Backstage in a containerized environment with limited filesystem access\n\n### References\n\n- [CWE-59: Improper Link Resolution Before File Access](https://cwe.mitre.org/data/definitions/59.html)\n- [OWASP Path Traversal](https://owasp.org/www-community/attacks/Path_Traversal)","status":"published","published":"2026-01-21T22:36:36Z","modified":"2026-02-03T03:12:21.539851Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L","level":"high"}],"cwes":["CWE-22","CWE-59"],"updated_at":"2026-11-02T15:46:56.281047Z"},{"id":"ROOT-APP-NPM-CVE-2026-24046","title":"CVE-2026-24046 in @rootio/backstage__backend-defaults - Patched by Root","description":"Root has patched CVE-2026-24046 in the @rootio/backstage__backend-defaults package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-06-04T13:45:52Z","modified":"2026-06-04T19:00:09.24839981Z","updated_at":"2026-11-02T15:53:27.649662Z"}]}}