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-2026-106505

CVE-2026-106505HIGH

Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   L   N  C  H  H  H    8.5   .0031   22.5     —

AFFECTED
  Product               Versions    Fixed
  backstage             < 1.50.5 –  —
  plugin-techdocs-node  < 1.14.6 –  —

TIMELINE
  Oct 6   Reserved by GitHub_M
  Oct 6   Published (CNA: GitHub_M)
  Oct 9   RESCORED — CVE-2026-106505 (backstage). CVSS 7.7 → 8.5 (NVD).

CWE-426, CWE-436 · CNA: GitHub_M · CVSS v3.1 · 5 references · NVD status: Analyzed

Description

Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
October 6, 2026	Reserved	Reserved by GitHub_M
October 6, 2026	Published	Published (CNA: GitHub_M)
October 9, 2026	RESCORED	RESCORED — CVE-2026-106505 (backstage). CVSS 7.7 → 8.5 (NVD).

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
backstage	backstage	—	< 1.50.5	—
@backstage	plugin-techdocs-node	—	< 1.14.6	—

Weaknesses

CWE-426 · CWE-436

References (5)

https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9 [Patch]
https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db [Patch]
https://github.com/backstage/backstage/releases/tag/v1.50.5 [Patch, Release Notes]
https://github.com/backstage/backstage/releases/tag/v1.54.6 [Patch, Release Notes]
https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx [Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-106505 at cve.org

Vendors: backstage · @backstage

Weaknesses: CWE-426 · CWE-436

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-106505 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.