CVE-2026-106558Published

Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker w…

Exact source revision recorded 25 Oct 2026 04:17:41 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

nvd · CVE-2026-106558

Published

Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-backed documentation source may bypass TechDocs sanitization and cause Python objects to be imported and instantiated in the generator runtime, leading to arbitrary code execution. Earlier fixes in versions 1.14.6 and 1.15.4 did not fully address the supported mapping representation of markdown_extensions. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network access. This issue is fixed in versions 1.14.8, 1.15.6, and 2.0.1.

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-502

Original publisher date fields

published: 2026-10-07T15:17:15.713

lastModified: 2026-10-13T14:25:12.163

11 source CPE criteria · context only

cpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.51.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.51.0:next0:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.51.0:next1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.51.0:next2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.51.0:next3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.55.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.55.0:next0:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.55.0:next1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage:1.55.0:next2:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 7 Oct 2026 15:17:15 UTC
Source modified: 13 Oct 2026 14:25:12 UTC
Observed here: 25 Oct 2026 04:17:41 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H