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CRITICAL severity

Backstage: Sensitive information exposure in ScaffolderGHSA-g2v8-7jhw-pp8p

CRITICALFix: backstage/backstage@66d2219

GHSA-g2v8-7jhw-pp8p is a critical-severity (CVSS 9.6) Information Exposure vulnerability in @backstage/plugin-scaffolder-backend. A fix is available for @backstage/plugin-scaffolder-backend — see the affected versions and patch details below.

Also known asCVE-2026-106501
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-g2v8-7jhw-pp8p.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs41th percentile — riskier than 41% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-g2v8-7jhw-pp8p by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,415 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

4 pkgs affected
📦@backstage/plugin-scaffolder-backend📦@backstage/plugin-scaffolder-backend📦@backstage/plugin-scaffolder-backend📦@backstage/plugin-scaffolder-backend

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.

Description

Impact

An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service.

Patches

Patched in @backstage/plugin-scaffolder-backend version 4.1.0

Workarounds

  • Configure scaffolder.task.read with the isTaskOwner condition so users can only read tasks they created.
  • Restrict affected integrations and workflows to trusted operators until an upgrade is available.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
📦npm@backstage/plugin-scaffolder-backendall versions3.3.1npm install @backstage/plugin-scaffolder-backend@3.3.1
📦npm@backstage/plugin-scaffolder-backend≥ 3.4.0&&< 3.4.13.4.1npm install @backstage/plugin-scaffolder-backend@3.4.1
📦npm@backstage/plugin-scaffolder-backend≥ 4.0.0&&< 4.0.34.0.3npm install @backstage/plugin-scaffolder-backend@4.0.3
📦npm@backstage/plugin-scaffolder-backend≥ 4.0.4&&< 4.1.04.1.0npm install @backstage/plugin-scaffolder-backend@4.1.0

Affected Products

2 products · 7 configurations
Application
backstagelinuxfoundation
≥ 1.51.0 && < 1.54.6
range
Application
backstage\/plugin-scaffolder-backendlinuxfoundation
≥ 4.0.4 && < 4.1.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @backstage/plugin-scaffolder-backend, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @backstage/plugin-scaffolder-backend to 3.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-g2v8-7jhw-pp8p is resolved across your whole dependency graph.

  3. Workarounds

    Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

This vulnerability is rated as an Important impact because authenticated users with read permissions to Scaffolder tasks can inspect internal run data, which may contain sensitive secrets or tokens for integrated downstream services. In environments running Red Hat Developer Hub and Ansible Automation Platform Portal…

Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Source: Red Hat security advisory for GHSA-g2v8-7jhw-pp8p (CC BY 4.0)
ProductFixed inAdvisory
Red Hat Ansible Automation Platform 2.2ansible-automation-platform/automation-portal:1792523640RHSA-2026:86675

Frequently Asked Questions

### Impact An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. ### Patches Patched in `@backstage/plugin-scaffolder-backend` version `4.1.0` ### Workarounds - Configure `scaffolder.task.read` with the `isTaskOwner` condition so users can only read tasks they created. - Restrict affected integrations and workflows to trusted operators until an upgrade is available.
O3 Security · Impact-Aware SCA

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Backstage: Sensitive information exposure in Scaffolder