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TI-2026-60083 Aliases CVE-2026-88064

Backstage: Improper input validation in TechDocs MkDocs configuration

Priority MEDIUM 42CWE-1336Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-1336.

Summary

Backstage is an open framework for building developer portals. Prior to 1.14.6 and from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by an authenticated user who can register or modify a TechDocs source. Unsafe Python YAML tags, markdown_extensions names and configuration, theme options, and extra_templates values can reach the documentation generator and cause unintended code execution. The resulting impact is limited to the files, credentials, network access, and other resources available to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0118 67th percentileScored 2026-11-07
Fix Fixed backstage (backstage): 1.14.6, 1.15.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
backstagebackstagebefore 1.14.6; 1.15.0 to before 1.15.41.14.6, 1.15.4Patch availableCNA
  • backstage Vendorbackstage Affected before 1.14.6; 1.15.0 to before 1.15.4 Fixed in 1.14.6, 1.15.4 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*before 1.14.6; 1.15.0 to before 1.15.4Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 1.14.6; 1.15.0 to before 1.15.4Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:* Versions before 1.14.6; 1.15.0 to before 1.15.4 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions before 1.14.6; 1.15.0 to before 1.15.4 Vulnerable ·backstage

Remediation

  • Fix · CNA backstage (backstage) Fixed in 1.14.6, 1.15.4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-88064

References

Patch 7

Advisory 1

  • 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-2026-69165 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
  • TI-2026-69074 Race condition in Backstage scaffolder backend task handling CVSS 3.1HIGH 8.5
See all 52 →

Sources

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