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Medium, CVSS 6.3amended

Backstage: Improper input validation in Confluence to Markdown scaffolder module

CVE-2026-106559GHSA-75qf-886x-5xf2

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@backstage/plugin-scaffolder-backend-module-confluence-to-markdown 0.3.25), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L
EPSS
  • CVE-2026-106559: 0.33% estimated exploitation activity in the next 30 days; percentile 26.44 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact Insufficient input validation in the Confluence to Markdown scaffolder module could allow an attacker to influence file write operations during template execution. Exploitation requires a Backstage user to run a template that processes attacker-influenced Confluence content. Patches Patched in @backstage/plugin-scaffolder-backend-module-confluence-to-markdown version 0.3.25 Workarounds If unable to update immediately: - Restrict Confluence edit access to trusted users. - Review Confluence page content before running scaffolder templates against untrusted pages.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-75qf-886x-5xf2

  2. Revision 2 · amended ·

    Amended from osv record GHSA-75qf-886x-5xf2

  3. Revision 1 · created ·

    Published from ghsa record GHSA-75qf-886x-5xf2

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-106559

Advisory: Backstage: Improper input validation in Confluence to Markdown scaffolder module
IDs: CVE-2026-106559, GHSA-75qf-886x-5xf2
Record: https://patchnext.com/advisories/cve-2026-106559 (revision 3, source checked 26 Oct 2026, 13:07 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @backstage/plugin-scaffolder-backend-module-confluence-to-markdown 0.3.25. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @backstage/plugin-scaffolder-backend-module-confluence-to-markdown: affected < 0.3.25; fixed in 0.3.25

## Suggested inspection (read-only)
- `npm ls @backstage/plugin-scaffolder-backend-module-confluence-to-markdown --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @backstage/plugin-scaffolder-backend-module-confluence-to-markdown.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-75qf-886x-5xf2 (GitHub-reviewed advisory GHSA-75qf-886x-5xf2 lists affected ranges: npm @backstage/plugin-scaffolder-backend-module-confluence-to-markdown >=0 <0.3.25)
- Verified: https://osv.dev/vulnerability/GHSA-75qf-886x-5xf2 (OSV record GHSA-75qf-886x-5xf2 lists affected ranges: npm @backstage/plugin-scaffolder-backend-module-confluence-to-markdown >=0 <0.3.25 (fixed))

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