CVE-2026-29186CRITICAL 9.8EPSS p37.3%
CVE-2026-29186CVE-2026-29186
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.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 0.48% probability of exploitation · percentile 37.3% · 2026-06-19T12:03:05Z |
| Published | 2026-03-07 |
| Last modified | 2026-03-11 |
Underlying weaknesses· 2
References
2
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Unrestricted Upload of File with Dangerous Typecwe-434 | 0% | live |
| Weakness | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')cwe-74 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.