CVE•Published 2026-03-07•Modified 2026-07-15•0 articles on news•5 live references•NVD data

CVE-2026-29186Linuxfoundation · Backstage_plugin-techdocs-node

Vulnerability data via NVD (ingested)

CVSS v3.1

7.7

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 48% of all CVEs

Weaknesses (CWE)

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')CWE-434Unrestricted Upload of File with Dangerous Type CWE-791Incomplete Filtering of Special Elements

Description

Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3.

Timeline

Published 2026-03-07

Modified 2026-07-15

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-29186

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Linuxfoundation Backstage Plugin-techdocs-node"

All exposed Linuxfoundation Backstage Plugin-techdocs-node instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Backstage Plugin-techdocs-node"

HTTP body or banner mentions "Backstage Plugin-techdocs-node" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-29186