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CVE-2026-106510

HIGH 7.7

Published 2026-10-07 · 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 remote code execution via crafted markdown_extensions in techdocs mkdocs.yml. An authenticated user who can register catalog entities can provide a crafted mkdocs.yml causing arbitrary OS command execution on the TechDocs build host when the docs are built. 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 · 41st 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-183: : Permissive List of Allowed Inputs
  • CWE-470: : Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

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-4488-j8vj-vqqv/GHSA-4488-j8vj-vqqv.json"
  }
}
    GitHub Advisory Database · GHSA-4488-j8vj-vqqv · Updated 2026-10-07T18:15:10.717894363Z

Vendor product assessments

  • rhdh/rhdh-hub-rhel9 as a component of Red Hat Developer Hub · known affected

    Vendor assessment for this product only.

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

    • workaround: To mitigate this vulnerability, implement the following operational and configuration controls: 1. Isolate documentation builds: Configure TechDocs to delegate builds to an external pipeline rather than executing them locally on the portal host. In `app-config.yaml`, set: ```yaml techdocs: builder: 'external' ``` Warning: Applying configuration changes to `app-config.yaml` requires restarting or redeploying the service to take effect. Delegating to external builders requires generating documentation through external CI/CD pipelines or dedicated build runners. 2. Restrict catalog registration: Restrict catalog registration privileges to authorized administrators through role-based access control (RBAC) and permission policies, preventing untrusted users from registering components with custom documentation paths. 3. Audit catalog repositories: Inspect existing entity repositories and their `mkdocs.yml` files for untrusted or unexpected `markdown_extensions` declarations before documentation builds are processed.
    • none available: Affected
    Red Hat · CVE-2026-106510 · Updated 2026-10-08T06:03:33+00:00
  • ansible-automation-platform/automation-portal as a component of Self-service automation portal 2 · known affected

    Vendor assessment for this product only.

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

    • workaround: To mitigate this vulnerability, implement the following operational and configuration controls: 1. Isolate documentation builds: Configure TechDocs to delegate builds to an external pipeline rather than executing them locally on the portal host. In `app-config.yaml`, set: ```yaml techdocs: builder: 'external' ``` Warning: Applying configuration changes to `app-config.yaml` requires restarting or redeploying the service to take effect. Delegating to external builders requires generating documentation through external CI/CD pipelines or dedicated build runners. 2. Restrict catalog registration: Restrict catalog registration privileges to authorized administrators through role-based access control (RBAC) and permission policies, preventing untrusted users from registering components with custom documentation paths. 3. Audit catalog repositories: Inspect existing entity repositories and their `mkdocs.yml` files for untrusted or unexpected `markdown_extensions` declarations before documentation builds are processed.
    • none available: Affected
    Red Hat · CVE-2026-106510 · Updated 2026-10-08T06:03:33+00:00
  • ansible-automation-platform/bootc-automation-portal-rhel9 as a component of Self-service automation portal 2 · known affected

    Vendor assessment for this product only.

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

    • workaround: To mitigate this vulnerability, implement the following operational and configuration controls: 1. Isolate documentation builds: Configure TechDocs to delegate builds to an external pipeline rather than executing them locally on the portal host. In `app-config.yaml`, set: ```yaml techdocs: builder: 'external' ``` Warning: Applying configuration changes to `app-config.yaml` requires restarting or redeploying the service to take effect. Delegating to external builders requires generating documentation through external CI/CD pipelines or dedicated build runners. 2. Restrict catalog registration: Restrict catalog registration privileges to authorized administrators through role-based access control (RBAC) and permission policies, preventing untrusted users from registering components with custom documentation paths. 3. Audit catalog repositories: Inspect existing entity repositories and their `mkdocs.yml` files for untrusted or unexpected `markdown_extensions` declarations before documentation builds are processed.
    • none available: Affected
    Red Hat · CVE-2026-106510 · Updated 2026-10-08T06:03:33+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

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS