CVE-2026-106559 backstage CVE debrief

Who should care

Defenders responsible for Backstage deployments using the Confluence to Markdown scaffolder module should assess exposure and prioritize updating to version 0.3.25. They should review Confluence page content before running scaffolder templates against untrusted pages and verify affected versions and exploitation. Security teams and vulnerability management teams should also prioritize updating to version 0.3.25.

Why it matters

Defenders should prioritize updating to version 0.3.25 of @backstage/plugin-scaffolder-backend-module-confluence-to-markdown to prevent potential influence on file write operations. Backstage users who run templates processing Confluence content should review page content before execution.

• Potential influence on file write operations during template execution
• Requires verification of affected versions and exploitation

Technical summary

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. The vulnerability is patched in version 0.3.25 of @backstage/plugin-scaffolder-backend-module-confluence-to-markdown. Defenders should prioritize updating to this version to prevent potential influence on file write operations. Backstage users who run templates processing Confluence content should review page content before execution.

Defensive priority

Defenders should prioritize updating to version 0.3.25 of @backstage/plugin-scaffolder-backend-module-confluence-to-markdown.

Recommended defensive actions

• Update to version 0.3.25 of @backstage/plugin-scaffolder-backend-module-confluence-to-markdown
• Restrict Confluence edit access to trusted users
• Review Confluence page content before running scaffolder templates against untrusted pages
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, including the affected package and patched version. The Backstage user must run a template that processes attacker-influenced Confluence content. The vulnerability allows attackers to influence file write operations during template execution. Defenders should verify affected versions and exploitation.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.