---
cve: "CVE-2026-29186"
severity: "HIGH"
cvss: 7.7
epss: "78%"
vendor: "backstage"
kev: false
exploited: false
published: "2026-03-07 15:15:55"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T02:14:35+02:00"
---

# CVE-2026-29186

> 7.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Referenzen

- <https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw>
- <https://access.redhat.com/errata/RHSA-2026:13826>
- <https://access.redhat.com/errata/RHSA-2026:9742>
- <https://access.redhat.com/security/cve/CVE-2026-29186>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2445480>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29186.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-29186) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_