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CVE-2026-106558 — Vulnerability in @backstage/plugin-techdocs-node...

HIGH

Backstage: Improper validation of TechDocs MkDocs configuration

Published October 7, 2026Updated October 7, 2026Source: osv

Summary

### Impact An attacker who can provide configuration to a TechDocs build may execute code in the generator runtime. Impact is greatest when documentation generation runs with backend credentials or host access. ### Patches Patched in `@backstage/plugin-techdocs-node` version `1.15.4`. ### Workarounds Use external TechDocs generation in an isolated environment without sensitive credentials or host access. Restrict and review changes to documentation configuration before generation.

Advisory Timeline

  • First published October 7, 2026 (5 days ago).
  • Last revised October 7, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update @backstage/plugin-techdocs-node to 1.15.4 or later
npm install @backstage/plugin-techdocs-node@1.15.4

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
@backstage/plugin-techdocs-node
npm
All versions1.15.4

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2026-106558?
Backstage: Improper validation of TechDocs MkDocs configuration This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.8/10).
How do I check if my project is affected by CVE-2026-106558?
CVE-2026-106558 affects @backstage/plugin-techdocs-node. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-106558 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-qmw3-745m-w99g

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