Publish GHSA-q2x5-4xjx-c6p9

Author: advisory-database[bot]

advisories/github-reviewed/2026/01/GHSA-q2x5-4xjx-c6p9/GHSA-q2x5-4xjx-c6p9.json

@@ -0,0 +1,99 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-q2x5-4xjx-c6p9",
+  "modified": "2026-01-21T22:49:37Z",
+  "published": "2026-01-21T22:49:37Z",
+  "aliases": [
+    "CVE-2026-24048"
+  ],
+  "summary": "Backstage has a Possible SSRF when reading from allowed URL's in `backend.reading.allow`",
+  "details": "### Impact\n\nThe `FetchUrlReader` component, used by the catalog and other plugins to fetch content from URLs, followed HTTP redirects automatically. This allowed an attacker who controls a host listed in `backend.reading.allow` to redirect requests to internal or sensitive URLs that are not on the allowlist, bypassing the URL allowlist security control.\n\nThis is a Server-Side Request Forgery (SSRF) vulnerability that could allow access to internal resources, but it does not allow attackers to include additional request headers.\n\n### Patches\n\nThis vulnerability is fixed in `@backstage/backend-defaults` version 0.12.2, 0.13.2, 0.14.1, and 0.15.0. Users should upgrade to this version or later.\n\n### Workarounds\n\n- Restrict `backend.reading.allow` to only trusted hosts that you control and that do not issue redirects\n- Ensure allowed hosts do not have open redirect vulnerabilities\n- Use network-level controls to block access from Backstage to sensitive internal endpoints\n\n### References\n\n- [OWASP SSRF Prevention Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Server_Side_Request_Forgery_Prevention_Cheat_Sheet.html)",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "@backstage/backend-defaults"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "0.12.2"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "@backstage/backend-defaults"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0.13.0"
+            },
+            {
+              "fixed": "0.13.2"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "@backstage/backend-defaults"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0.14.0"
+            },
+            {
+              "fixed": "0.14.1"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-q2x5-4xjx-c6p9"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/backstage/backstage/commit/27f9061d24affd1b9212fe0abd476bfc3fbaedcb"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/backstage/backstage"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-918"
+    ],
+    "severity": "LOW",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-01-21T22:49:37Z",
+    "nvd_published_at": null
+  }
+}