Vulnerability-Lookup

CVE-2026-29186 (GCVE-0-2026-29186)

Vulnerability from cvelistv5 – Published: 2026-03-07 15:03 – Updated: 2026-03-09 20:24

Title

@backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

Summary

Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3.

Severity ?

7.7 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type
CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Assigner

GitHub_M

References

URL

Tags

https://github.com/backstage/backstage/security/a…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	backstage	backstage	Affected: < 1.14.3

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-29186

Vulnerability from fkie_nvd - Published: 2026-03-07 15:15 - Updated: 2026-03-11 18:00

Severity ?

7.7 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw	Vendor Advisory

Impacted products

	Vendor	Product	Version
	linuxfoundation	backstage_plugin-techdocs-node	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "320379D5-BAE8-4314-92DF-83E3D2B8A4B8",
              "versionEndExcluding": "1.14.3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs\u0027 security controls. This issue has been patched in version 1.14.3."
    },
    {
      "lang": "es",
      "value": "Backstage es un framework abierto para construir portales de desarrolladores. Antes de la versi\u00f3n 1.14.3, esta es una vulnerabilidad de omisi\u00f3n de configuraci\u00f3n que permite la ejecuci\u00f3n de c\u00f3digo arbitrario. El paquete @backstage/plugin-techdocs-node utiliza una lista de permitidos para filtrar claves de configuraci\u00f3n peligrosas de MkDocs durante el proceso de compilaci\u00f3n de la documentaci\u00f3n. Una brecha en esta lista de permitidos permite a los atacantes crear un mkdocs.yml que provoca la ejecuci\u00f3n de c\u00f3digo Python arbitrario, eludiendo completamente los controles de seguridad de TechDocs. Este problema ha sido parcheado en la versi\u00f3n 1.14.3."
    }
  ],
  "id": "CVE-2026-29186",
  "lastModified": "2026-03-11T18:00:01.620",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.7,
          "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",
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        "impactScore": 5.3,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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}

GHSA-928R-FM4V-MVRW

Vulnerability from github – Published: 2026-03-05 00:12 – Updated: 2026-03-09 15:46

Summary

TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

Details

Impact

This is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process.

A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls.

Patches

Patched in @backstage/plugin-techdocs-node version 1.14.3

Workarounds

If users cannot upgrade immediately:

Use Docker mode with restricted access: Configure TechDocs with runIn: docker instead of runIn: local. This provides container isolation, though it does not fully mitigate the risk.
Restrict repository access: Limit who can modify mkdocs.yml files in repositories that TechDocs processes. Only allow trusted contributors.
Manual review: Implement PR review requirements for changes to mkdocs.yml files to detect malicious hooks configurations before they are merged.
Downgrade MkDocs: Use MkDocs < 1.4.0 (e.g., 1.3.1) which does not support hooks. Note: This may limit access to newer MkDocs features.

Note: Building documentation in CI/CD pipelines using @techdocs/cli does not mitigate this vulnerability, as the CLI uses the same vulnerable @backstage/plugin-techdocs-node package.

Resources

MkDocs Hooks Documentation MkDocs 1.4 Release Notes TechDocs Architecture

Severity ?

7.7 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.14.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@backstage/plugin-techdocs-node"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.14.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29186"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434",
      "CWE-74"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-05T00:12:07Z",
    "nvd_published_at": "2026-03-07T15:15:55Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nThis is a configuration bypass vulnerability that enables arbitrary code execution. The `@backstage/plugin-techdocs-node` package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. \n\nA gap in this allowlist allows attackers to craft an `mkdocs.yml` that causes arbitrary Python code execution, completely bypassing TechDocs\u0027 security controls.     \n\n### Patches\n\nPatched in `@backstage/plugin-techdocs-node` version 1.14.3\n\n### Workarounds\nIf users cannot upgrade immediately:\n\n1. Use Docker mode with restricted access: Configure TechDocs with `runIn: docker` instead of `runIn: local`. This provides container isolation, though it does not fully mitigate the risk.\n2. Restrict repository access: Limit who can modify `mkdocs.yml` files in repositories that TechDocs processes. Only allow trusted contributors.\n3. Manual review: Implement PR review requirements for changes to `mkdocs.yml` files to detect malicious hooks configurations before they are merged.\n4. Downgrade MkDocs: Use MkDocs \u003c 1.4.0 (e.g., 1.3.1) which does not support hooks. Note: This may limit access to newer MkDocs features.\n\nNote: Building documentation in CI/CD pipelines using `@techdocs/cli` does not mitigate this vulnerability, as the CLI uses the same vulnerable `@backstage/plugin-techdocs-node` package.\n\n### Resources\n[MkDocs Hooks Documentation](https://www.mkdocs.org/user-guide/configuration/#hooks)\n[MkDocs 1.4 Release Notes](https://www.mkdocs.org/about/release-notes/#version-14-2022-09-27)\n[TechDocs Architecture](https://backstage.io/docs/features/techdocs/architecture)",
  "id": "GHSA-928r-fm4v-mvrw",
  "modified": "2026-03-09T15:46:44Z",
  "published": "2026-03-05T00:12:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29186"
    },
    {
      "type": "WEB",
      "url": "https://backstage.io/docs/features/techdocs/architecture"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/backstage/backstage"
    },
    {
      "type": "WEB",
      "url": "https://www.mkdocs.org/about/release-notes/#version-14-2022-09-27"
    },
    {
      "type": "WEB",
      "url": "https://www.mkdocs.org/user-guide/configuration/#hooks"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-29186 (GCVE-0-2026-29186)

FKIE_CVE-2026-29186

GHSA-928R-FM4V-MVRW

Impact

Patches

Workarounds

Resources

Tags

Sightings

Nomenclature