CVE-2026-106508 (GCVE-0-2026-106508)

Vulnerability from cvelistv5 – Published: 2026-10-06 21:47 – Updated: 2026-10-06 21:47
VLAI
Title
Backstage: Potential file exposure through local TechDocs publisher
Summary
Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: 'local'), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users. This is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected. This issue is fixed in version 1.15.4.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7565 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
backstage backstage Affected: < 1.54.6
guessed Create a notification for this product.
@backstage plugin-techdocs-node Affected: < 1.15.4
guessed Create a notification for this product.
Show details on NVD website
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{
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          "vendor": "backstage",
          "versions": [
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              "status": "affected",
              "version": "\u003c 1.54.6"
            }
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        {
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              "version": "\u003c 1.15.4"
            }
          ]
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      "descriptions": [
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          "value": "Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: \u0027local\u0027), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users. This is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected. This issue is fixed in version 1.15.4."
        }
      ],
      "metrics": [
        {
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            "attackVector": "NETWORK",
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            "baseScore": 5.3,
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            "confidentialityImpact": "HIGH",
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      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
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          "name": "https://github.com/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6v",
          "tags": [
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          ],
          "url": "https://github.com/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6v"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4",
          "tags": [
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          "url": "https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4"
        },
        {
          "name": "https://github.com/backstage/backstage/releases/tag/v1.54.6",
          "tags": [
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          ],
          "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
        }
      ],
      "source": {
        "advisory": "GHSA-cm77-ch27-6w6v",
        "discovery": "UNKNOWN"
      },
      "title": "Backstage: Potential file exposure through local TechDocs publisher"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-106508",
    "datePublished": "2026-10-06T21:47:35.516Z",
    "dateReserved": "2026-10-06T18:46:47.767Z",
    "dateUpdated": "2026-10-06T21:47:35.516Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-10-08",
      "epss": "0.00283",
      "percentile": "0.19039"
    },
    "nvd": {
      "cve": {
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          {
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                "product": "backstage",
                "vendor": "backstage",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 1.54.6"
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                    "version": "\u003c 1.15.4"
                  }
                ]
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            "source": "security-advisories@github.com"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: \u0027local\u0027), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users. This is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected. This issue is fixed in version 1.15.4."
          }
        ],
        "id": "CVE-2026-106508",
        "lastModified": "2026-10-07T13:58:29.527",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
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                "confidentialityImpact": "HIGH",
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                "version": "3.1"
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              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-06T22:17:06.310",
        "references": [
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            "source": "security-advisories@github.com",
            "url": "https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4"
          },
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            "url": "https://github.com/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6v"
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        "vulnStatus": "Undergoing Analysis",
        "weaknesses": [
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                "value": "CWE-22"
              },
              {
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                "value": "CWE-59"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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