CVE-2026-106556: backstage Command Injection — Fix

Description

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.

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CVSS v3.1 Score

7.7

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

EPSS — Exploit Prediction

0.0026

Probability of exploitation

0.17%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-78 OS Command Injection

CWE-184 CWE-184

Affected Products

Vendor	Product	Versions
linuxfoundation	backstage	< 1.50.5
linuxfoundation	backstage	1.51.1 — 1.54.6
linuxfoundation	backstage	All
linuxfoundation	backstage	All
linuxfoundation	backstage	All
linuxfoundation	backstage	All
linuxfoundation	backstage	All
linuxfoundation	backstage_plugin-techdocs-node	< 1.14.6
linuxfoundation	backstage_plugin-techdocs-node	1.15.0 — 1.15.4

References

Advisories & Patches

https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26 https://github.com/backstage/backstage/commit/b6d1aea0bef99b8dfec3c8746032474867ba677a https://github.com/backstage/backstage/releases/tag/v1.50.5 https://github.com/backstage/backstage/releases/tag/v1.54.6 https://github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg

Frequently Asked Questions

What is CVE-2026-106556? +

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4. It has a CVSS v3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-106556? +

CVE-2026-106556 has a CVSS v3.1 score of 7.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0026, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-106556? +

CVE-2026-106556 affects products from linuxfoundation, specifically: backstage, backstage_plugin-techdocs-node. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-106556? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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