Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-106559

CVE-2026-106559MEDIUM

Backstage: Improper input validation in Confluence to Markdown scaffolder module

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  N  H  N    6.5   .0033   24.8     —

AFFECTED
  Product                                                  Versions    Fixed
  backstage                                                < 1.54.6 –  —
  plugin-scaffolder-backend-module-confluence-to-markdown  < 0.3.25 –  —

TIMELINE
  Oct 6   Reserved by GitHub_M
  Oct 7   Published (CNA: GitHub_M)
  Oct 16  RESCORED — CVE-2026-106559 (backstage). CVSS 6.3 → 6.5 (NVD).

CWE-22, CWE-73 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

Backstage is an open framework for building developer portals. Prior to 0.3.25, the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package is affected by improper input validation in confluence to markdown scaffolder module. 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. This issue is fixed in version 0.3.25.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
October 6, 2026	Reserved	Reserved by GitHub_M
October 7, 2026	Published	Published (CNA: GitHub_M)
October 16, 2026	RESCORED	RESCORED — CVE-2026-106559 (backstage). CVSS 6.3 → 6.5 (NVD).

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
backstage	backstage	—	< 1.54.6	—
@backstage	plugin-scaffolder-backend-module-confluence-to-markdown	—	< 0.3.25	—

Weaknesses

CWE-22 · CWE-73

References (3)

https://github.com/backstage/backstage/commit/506c2c11bce3ed9d1f8f50de5d6474b16e43a65e [Patch]
https://github.com/backstage/backstage/releases/tag/v1.54.6 [Patch, Release Notes]
https://github.com/backstage/backstage/security/advisories/GHSA-75qf-886x-5xf2 [Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-106559 at cve.org

Vendors: backstage · @backstage

Weaknesses: CWE-22 · CWE-73

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-106559 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.