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CVE-2026-106509

Linuxfoundation Backstage code injection

7.7 HIGHPublic exploitEPSS 0.37%
  1. Published6 Oct 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

Affected products

Linuxfoundation Backstage≥ 1.51.1 < 1.54.6 · < 1.50.5 · 1.51.0
Linuxfoundation Backstage Plugin-techdocs-node≥ 1.15.0 < 1.15.4 · < 1.14.6

Remediation

Fixed in
Linuxfoundation Backstage≥ 1.54.6
Linuxfoundation Backstage Plugin-techdocs-node≥ 1.15.4

References

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Frequently asked

Is CVE-2026-106509 being actively exploited?

CVE-2026-106509 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.37%.

How severe is CVE-2026-106509?

CVE-2026-106509 has a CVSS 3.1 base score of 7.7, rated high. EPSS estimates a 0.37% probability of exploitation.

Which products are affected by CVE-2026-106509?

Affected products include Linuxfoundation Backstage, Linuxfoundation Backstage Plugin-techdocs-node.

How do I fix CVE-2026-106509?

Upgrade affected software to a fixed version, for example Linuxfoundation Backstage 1.54.6, Linuxfoundation Backstage Plugin-techdocs-node 1.15.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-106509 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.