CVE-2026-106509CWE-1336CWE-94code-injection

CVE-2026-106509

High · published October 7, 2026

CVSS v3.1
7.7
EPSS
0%
Percentile
29.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00370 · 29.8th percentile
Weaknesses
CWE-1336 · Improper Neutralization of Special Elements Used in a Template Engine; CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-10-07T02:17Z
Affected products (9)
ProductVersionsFixed in
linuxfoundation/backstage_plugin-techdocs-node< 1.14.61.14.6
linuxfoundation/backstage_plugin-techdocs-node≥ 1.15.0, < 1.15.41.15.4
linuxfoundation/backstage< 1.50.51.50.5
linuxfoundation/backstage≥ 1.51.1, < 1.54.61.54.6
linuxfoundation/backstageall versions—
linuxfoundation/backstageall versions—
linuxfoundation/backstageall versions—
linuxfoundation/backstageall versions—
linuxfoundation/backstageall versions—
References (5)
https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb · [email protected]https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d · [email protected]https://github.com/backstage/backstage/releases/tag/v1.50.5 · [email protected]https://github.com/backstage/backstage/releases/tag/v1.54.6 · [email protected]https://github.com/backstage/backstage/security/advisories/GHSA-8w7q-29mw-gf5c · [email protected]
EPSS history
Timeline
  • 08 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 06 OCT 21:50Z
    Backstage: Improper validation of MkDocs theme configuration in TechDocs
    cvelistv5