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‎advisories/github-reviewed/2026/01/GHSA-rq6q-wr2q-7pgp/GHSA-rq6q-wr2q-7pgp.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-rq6q-wr2q-7pgp",
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"modified": "2026-01-21T22:36:36Z",
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"published": "2026-01-21T22:36:36Z",
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"aliases": [
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"CVE-2026-24046"
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],
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"summary": "Backstage has a Possible Symlink Path Traversal in Scaffolder Actions",
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"details": "### 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)",
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"severity": [
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{
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"type": "CVSS_V3",
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"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "npm",
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"name": "@backstage/backend-defaults"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "0.12.2"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "@backstage/backend-defaults"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0.13.0"
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},
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{
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"fixed": "0.13.2"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "@backstage/backend-defaults"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0.14.0"
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},
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{
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"fixed": "0.14.1"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "@backstage/plugin-scaffolder-backend"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "2.2.2"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "@backstage/plugin-scaffolder-backend"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "3.0.0"
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},
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{
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"fixed": "3.0.2"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "@backstage/plugin-scaffolder-backend"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "3.1.0"
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},
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{
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"fixed": "3.1.1"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "@backstage/plugin-scaffolder-node"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "0.11.2"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "npm",
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"name": "@backstage/plugin-scaffolder-node"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0.12.0"
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},
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{
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"fixed": "0.12.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "WEB",
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"url": "https://github.com/backstage/backstage/security/advisories/GHSA-rq6q-wr2q-7pgp"
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},
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{
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"type": "WEB",
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"url": "https://github.com/backstage/backstage/commit/c641c147ab371a9a8a2f5f67fdb7cb9c97ef345d"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/backstage/backstage"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-22",
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"CWE-59"
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],
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"severity": "HIGH",
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"github_reviewed": true,
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"github_reviewed_at": "2026-01-21T22:36:36Z",
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"nvd_published_at": null
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}
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}

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