Vulnpedia
← Search CVEs

CVE-2026-106509

HIGH 7.7

Published 2026-10-06 · Last modified 2026-10-07

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.

ELEVATED IMPACT

Severe if exploited (CVSS 7.7), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.5%chance of exploitation in 30 days · 44th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.7CVSS 3.1 · HIGH

  • ConfidentialityHigh
  • IntegrityLow
  • AvailabilityLow

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Backstage @Backstage Linuxfoundation

Products Backstage Plugin Techdocs Node Backstage Plugin Techdocs Node

Weakness (CWE)

  • CWE-94: : Improper Control of Generation of Code ('Code Injection')
  • CWE-1336: : Improper Neutralization of Special Elements Used in a Template Engine

CVSS vector

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

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • @backstage/plugin-techdocs-node npm

    pkg:npm/%40backstage/plugin-techdocs-node

    SEMVER range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 1.15.4
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-8w7q-29mw-gf5c/GHSA-8w7q-29mw-gf5c.json"
  }
}
    GitHub Advisory Database · GHSA-8w7q-29mw-gf5c · Updated 2026-10-07T16:30:04.718106469Z

Vendor product assessments

  • rhdh/rhdh-hub-rhel9 as a component of Red Hat Developer Hub · under investigation

    Vendor assessment for this product only.

    pkg:oci/rhdh-hub-rhel9?repository_url=registry.redhat.io/rhdh/rhdh-hub-rhel9

    Red Hat · CVE-2026-106509 · Updated 2026-10-09T18:19:48+00:00
  • ansible-automation-platform/automation-portal as a component of Self-service automation portal 2 · under investigation

    Vendor assessment for this product only.

    pkg:oci/automation-portal?repository_url=registry.redhat.io/ansible-automation-platform/automation-portal

    Red Hat · CVE-2026-106509 · Updated 2026-10-09T18:19:48+00:00
  • ansible-automation-platform/bootc-automation-portal-rhel9 as a component of Self-service automation portal 2 · under investigation

    Vendor assessment for this product only.

    pkg:oci/bootc-automation-portal-rhel9?repository_url=registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9

    Red Hat · CVE-2026-106509 · Updated 2026-10-09T18:19:48+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxfoundationBackstage Plugin Techdocs Node< 1.14.6
LinuxfoundationBackstage Plugin Techdocs Node≥ 1.15.0 and < 1.15.4
LinuxfoundationBackstage< 1.50.5
LinuxfoundationBackstage≥ 1.51.1 and < 1.54.6
LinuxfoundationBackstage1.51.0
LinuxfoundationBackstage1.51.0
LinuxfoundationBackstage1.51.0
LinuxfoundationBackstage1.51.0
LinuxfoundationBackstage1.51.0

All CVSS metrics

  • HIGH 7.7 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
  • HIGH 7.7 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
  • HIGH 8.8 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Exploit-tagged references (not proof of a PoC)

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS