# CVE-2026-106502: Backstage plugin-scaffolder-backend credential exposure in task events

Source: https://junglewise.ai/threats/cve-2026-106502-backstage-is-an-open-framework-for-building-developer-portals  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-06. Updated: 2026-10-06  
License: CC BY 4.0 with a link back

CVE-2026-106502 · Severity: medium · CVSS 5.3 · Published 2026-10-06

Backstage is an open framework for building developer portals used by organizations to centralize developer tools and services. The Scaffolder plugin in versions before 4.1.0 could leak sensitive backend credentials in task failure event logs, allowing authenticated users to retrieve secrets that were meant to be redacted. This exposure could lead to unauthorized access to systems and services that relied on those credentials.

Technologies: [@backstage/plugin-scaffolder-backend (npm)](https://junglewise.ai/threats/technologies/backstage-plugin-scaffolder-backend). Vendors: [Backstage](https://junglewise.ai/threats/vendors/backstage), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-106502 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-106502 being exploited in the wild.

**How severe is CVE-2026-106502?** Medium severity, with a CVSS score of 5.3, published 6 October 2026.

**Which products and versions are affected?** Backstage Scaffolder Backend before 4.1.0; @backstage/plugin-scaffolder-backend (npm) < 4.1.0, SEMVER:introduced=0,fixed=4.1.0.

**Is there a fix for CVE-2026-106502?** Yes. @backstage/plugin-scaffolder-backend (npm): upgrade to 4.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-106502 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-106502?** Check whether you run Backstage Scaffolder Backend or @backstage/plugin-scaffolder-backend (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @backstage/plugin-scaffolder-backend (npm): upgrade to 4.1.0 or later

  ```sh
  npm install @backstage/plugin-scaffolder-backend@4.1.0
  ```


## Technical details

The @backstage/plugin-scaffolder-backend package failed to apply configured log redactions to task failure details, exposing backend-managed credentials in task events. An authenticated user could extract these credentials from Scaffolder task failure events under specific template and failure conditions. The fix ensures that log redaction policies are properly applied to all task failure details.

## Affected products

- Backstage Scaffolder Backend before 4.1.0

## Identifiers

- CVE-2026-106502
- GHSA-95p4-vv4g-jxxm

## Timeline

- 2026-10-06: disclosed
- 2026-08-27: patched

## References

- [https://github.com/backstage/backstage/commit/3f1e869708f002fb9838624b7379deb251691b47](https://github.com/backstage/backstage/commit/3f1e869708f002fb9838624b7379deb251691b47)
- [https://github.com/backstage/backstage/releases/tag/v1.54.6](https://github.com/backstage/backstage/releases/tag/v1.54.6)

## Related threats

- [Backstage scaffolder task list input validation vulnerability](https://junglewise.ai/threats/cve-2026-106506-backstage-is-an-open-framework-for-building-developer-portals)
- [Backstage scaffolder-backend sensitive information exposure in task logs](https://junglewise.ai/threats/cve-2026-106504-backstage-is-an-open-framework-for-building-developer-portals)
- [Backstage Scaffolder Backend authorization bypass in action input validation](https://junglewise.ai/threats/cve-2026-106503-backstage-is-an-open-framework-for-building-developer-portals)
- [Backstage plugin-scaffolder-backend sensitive information exposure](https://junglewise.ai/threats/cve-2026-106501-backstage-is-an-open-framework-for-building-developer-portals)
- [Backstage plugin-scaffolder-backend improper task state validation](https://junglewise.ai/threats/cve-2026-106500-backstage-is-an-open-framework-for-building-developer-portals)