{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.49.6"
              },
              {
                "introduced": "1.50.0-next.0"
              },
              {
                "fixed": "1.50.5"
              },
              {
                "introduced": "1.51.0-next.0"
              },
              {
                "fixed": "1.51.3"
              },
              {
                "introduced": "1.52.0-next.0"
              },
              {
                "fixed": "1.53.2"
              },
              {
                "introduced": "1.54.0-next.0"
              },
              {
                "fixed": "1.54.6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "f29d18c2fd55f0448f0fbaf8525178676dccd52d"
            },
            {
              "introduced": "e2fdc2b61fe9046574a8fc1d99b18053018db0a8"
            },
            {
              "introduced": "65456c31b62e3cc88777a1771c28f38f0ad896da"
            },
            {
              "introduced": "3aa8f7c87c6f2ad08c850844428f647bdca8a016"
            },
            {
              "fixed": "e8c20440640d1d2baffbf6e44a71e6960e5eb2ec"
            },
            {
              "fixed": "f3e982bd0530f51760c8a70d21eafaa7aed2e6eb"
            },
            {
              "fixed": "788f477f539d9c38fcf33825fb85805362c20fc0"
            },
            {
              "fixed": "ed841d1eeb744b9c78726580202cfaffcaed8db0"
            },
            {
              "fixed": "0e67bc1fc88fba3a8cb716d3584cef05ecbcf9a8"
            },
            {
              "fixed": "0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e"
            },
            {
              "fixed": "286bfc1f9cc3608a073b41016be302785be385d1"
            },
            {
              "fixed": "61a10f19926aeda7f4a32de48d733e6710584634"
            },
            {
              "fixed": "99729e925fd2bd40ba210022351a0ee6318e6197"
            },
            {
              "fixed": "e786ac309ed2d775daf2309393c015c43902d6f6"
            }
          ],
          "repo": "https://github.com/backstage/backstage",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-qgvj-qcf8-xq73"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-863",
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106498.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "3.5.1"
          },
          {
            "introduced": "3.6.0"
          },
          {
            "fixed": "3.6.2"
          },
          {
            "introduced": "3.7.0"
          },
          {
            "fixed": "3.7.2"
          },
          {
            "introduced": "3.8.0"
          },
          {
            "fixed": "3.8.2"
          },
          {
            "introduced": "3.9.0"
          },
          {
            "fixed": "3.9.1"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.",
  "id": "CVE-2026-106498",
  "modified": "2026-10-08T02:30:23.533996868Z",
  "published": "2026-10-06T21:23:37.560Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.49.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.50.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.51.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.53.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106498.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-106498"
    },
    {
      "type": "FIX",
      "url": "https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1"
    },
    {
      "type": "FIX",
      "url": "https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634"
    },
    {
      "type": "FIX",
      "url": "https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197"
    },
    {
      "type": "FIX",
      "url": "https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Backstage: Improper URL validation in catalog entity placeholder resolution"
}