CVE-2026-106505 (GCVE-0-2026-106505)

Vulnerability from cvelistv5 – Published: 2026-10-06 21:43 – Updated: 2026-10-06 21:43
VLAI
Title
Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend
Summary
Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
backstage backstage Affected: < 1.50.5
Affected: >= 1.51.0-next.0, < 1.54.6
guessed Create a notification for this product.
@backstage plugin-techdocs-node Affected: < 1.14.6
Affected: >= 1.15.0, < 1.15.4
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "backstage",
          "vendor": "backstage",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.50.5"
            },
            {
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              "version": "\u003e= 1.51.0-next.0, \u003c 1.54.6"
            }
          ]
        },
        {
          "product": "plugin-techdocs-node",
          "vendor": "@backstage",
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              "version": "\u003c 1.14.6"
            },
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              "version": "\u003e= 1.15.0, \u003c 1.15.4"
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          "lang": "en",
          "value": "Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L",
            "version": "3.1"
          }
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      ],
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          "descriptions": [
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              "description": "CWE-436: Interpretation Conflict",
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            }
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        "shortName": "GitHub_M"
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          "name": "https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx",
          "tags": [
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          ],
          "url": "https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx"
        },
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          "name": "https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9",
          "tags": [
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          ],
          "url": "https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9"
        },
        {
          "name": "https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db",
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          "url": "https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db"
        },
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          "name": "https://github.com/backstage/backstage/releases/tag/v1.50.5",
          "tags": [
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          ],
          "url": "https://github.com/backstage/backstage/releases/tag/v1.50.5"
        },
        {
          "name": "https://github.com/backstage/backstage/releases/tag/v1.54.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
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      ],
      "source": {
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        "discovery": "UNKNOWN"
      },
      "title": "Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-106505",
    "datePublished": "2026-10-06T21:43:08.370Z",
    "dateReserved": "2026-10-06T18:46:47.766Z",
    "dateUpdated": "2026-10-06T21:43:08.370Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-10-07",
      "epss": "0.00274",
      "percentile": "0.18161"
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    "nvd": {
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          {
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              {
                "product": "backstage",
                "vendor": "backstage",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 1.50.5"
                  },
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                  }
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                    "version": "\u003e= 1.15.0, \u003c 1.15.4"
                  }
                ]
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4."
          }
        ],
        "id": "CVE-2026-106505",
        "lastModified": "2026-10-07T13:58:29.527",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
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              "impactScore": 5.3,
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              "type": "Secondary"
            }
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        },
        "published": "2026-10-06T22:17:05.837",
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            "url": "https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9"
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            "url": "https://github.com/backstage/backstage/releases/tag/v1.50.5"
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          {
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            "url": "https://github.com/backstage/backstage/releases/tag/v1.54.6"
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            "url": "https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
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            "description": [
              {
                "lang": "en",
                "value": "CWE-426"
              },
              {
                "lang": "en",
                "value": "CWE-436"
              }
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            "source": "security-advisories@github.com",
            "type": "Primary"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-07T05:17:27+00:00",
      "cve": "CVE-2026-106505",
      "id": "CVE-2026-106505",
      "initial_release_date": "2026-10-06T21:43:08.370000+00:00",
      "product_status:known_affected": "3",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "plugin-techdocs-node: @backstage/plugin-techdocs-node: Backstage plugin-techdocs-node: Arbitrary code execution via MkDocs configuration sanitizer bypass",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106505.json",
      "version": "3"
    }
  }
}



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