CVE-2026-106509
Backstage: Improper validation of MkDocs theme configuration in TechDocs
No known exploitation. EPSS puts it in the 29th percentile. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- BackstageAffected: < 1.50.5Upgrade to: not statedAffected: >= 1.51.0-next.0, < 1.54.6Upgrade to: not statedStated by: CVE record
- @backstage Plugin-techdocs-nodeAffected: < 1.14.6Upgrade to: not statedAffected: >= 1.15.0, < 1.15.4Upgrade to: not statedStated by: CVE record
- Linuxfoundation Backstage Plugin-techdocs-nodeAffected: < 1.14.6Upgrade to: 1.14.6Stated by: NVD
- Linuxfoundation BackstageAffected: < 1.50.5Upgrade to: 1.50.5Stated by: NVD
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.4% chance of exploitation activity in the next 30 days, which ranks it in the 29th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
8 events over 3 days, from the signal feeds we watch.
- Patch availablerecord updated
- Record updatedrecord updated
- Publishedweakness classified, att&ck mapped, record updated
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
Scored 7.7 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
- Privileges Required LowRequires basic user-level privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity LowData modification is possible but limited in scope or consequence
- Availability LowReduced performance or intermittent disruption of service
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
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