CVE-2026-106509

highpriority · track · 35EPSS 0.005 · 44 %ileUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.52% (44th) EPSS

CVSS 8.8 · high

Is it mine?

6 products

Check your exposure

Who says so?

2 sources

nvd · osv

EPSS · scored 2026-10-27

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.17.7highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:Lsecondary · security-advisories@github.comexploitability 1.8 · impact 5.3

v3.17.7highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:Lsecondary · OSV

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1336USCWE-1336USCWE-94USCWE-94US

affected products (6)

Products and version ranges known to be affected.

linuxfoundation backstage< 1.50.5nvdUScpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
linuxfoundation backstage= 1.51.0nvdUScpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
linuxfoundation backstage1.51.1 → 1.54.6nvdUScpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
linuxfoundation backstage plugin-techdocs-node< 1.14.6nvdUScpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*
linuxfoundation backstage plugin-techdocs-node1.15.0 → 1.15.4nvdUScpe:2.3:a:linuxfoundation:backstage_plugin-techdocs-node:*:*:*:*:*:*:*:*
npm @backstage/plugin-techdocs-node< 1.15.4osvUSpkg:npm/%40backstage/plugin-techdocs-node

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-8w7q-29mw-gf5cBackstage: Improper validation of MkDocs theme configuration in TechDocs2026-10-07ghsa · osvUS
### Impact When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in `mkdocs.yml` that cause arbitrary code execution during the documentation build process. ### Patches Patched in `@backstage/plugin-techdocs-node` version `1.15.4` ### Workarounds - Configure TechDocs with `techdocs.generator.runIn: 'docker'` instead of `'local'` to provide container isolation, though this does not fully mitigate the risk. - Restrict write access to repositories registered in the Backstage catalog to trusted users.

sources

Which sources assert this record, and when.

nvd osv NVD CVE.org MITRE

published 2026-10-06modified 2026-10-09

references (5) nvd

External citations — patches, advisories, analysis.

https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbbExploitPatch
https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9dExploitPatch
https://github.com/backstage/backstage/releases/tag/v1.50.5Release Notes
https://github.com/backstage/backstage/releases/tag/v1.54.6Release Notes
https://github.com/backstage/backstage/security/advisories/GHSA-8w7q-29mw-gf5cVendor AdvisoryMitigation

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan