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TI-2021-12330 Aliases CVE-2021-32662GHSA-pgf8-28gg-vpr6

TechDocs mkdocs.yml path traversal

Priority LOW 31CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

Backstage is an open platform for building developer portals, and techdocs-common contains common functionalities for Backstage's TechDocs. In `@backstage/techdocs-common` versions prior to 0.6.3, a malicious actor could read sensitive files from the environment where TechDocs documentation is built and published by setting a particular path for `docs_dir` in `mkdocs.yml`. These files would then be available over the TechDocs backend API. This vulnerability is mitigated by the fact that an attacker would need access to modify the `mkdocs.yml` in the documentation source code, and would also need access to the TechDocs backend API. The vulnerability is patched in the `0.6.3` release of `@backstage/techdocs-common`.

Why it matters now

EPSS 0.0128 70th percentileScored 2026-11-07
Fix Fixed backstage (backstage): 0.6.3@backstage/techdocs-common (npm): 0.6.3

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
backstagebackstagebefore 0.6.30.6.3Patch availableCNA
—@backstage/techdocs-common (npm)before 0.6.30.6.3Patch availableGHSA-pgf8-28gg-vpr6
  • backstage Vendorbackstage Affected before 0.6.3 Fixed in 0.6.3 Patch available CNA
  • @backstage/techdocs-common (npm) Vendor— Affected before 0.6.3 Fixed in 0.6.3 Patch available GHSA-pgf8-28gg-vpr6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 0.6.3Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions before 0.6.3 Vulnerable ·backstage

Remediation

  • Fix · CNA backstage (backstage) Fixed in 0.6.3
  • Fix · GHSA-pgf8-28gg-vpr6 @backstage/techdocs-common (npm) Fixed in 0.6.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-32662
  2. 2026-10-03 Alias added: GHSA-pgf8-28gg-vpr6

References

Patch 1

Advisory 3

  • TI-2023-17988 Insecure sandbox in Backstage Scaffolder plugin CVSS 3.1CRITICAL 9.9
  • TI-2026-69075 Sensitive information exposure in Backstage Scaffolder CVSS 3.1CRITICAL 9.6
  • TI-2026-69061 Path traversal in Backstage Bitbucket pull-request scaffolder actions CVSS 3.1CRITICAL 9.9
  • TI-2026-60083 Backstage: Improper input validation in TechDocs MkDocs configuration CVSS 3.1HIGH 8.8
  • TI-2026-69165 Backstage TechDocs config flaw allows code execution CVSS 3.1HIGH 8.8
  • TI-2026-69083 Code injection via MkDocs theme configuration in Backstage TechDocs CVSS 3.1HIGH 8.8
See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences