CVE-2026-29186

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.

• CWE-74
• CWE-434
• CWE-434
• CWE-791

• https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrwVendor Advisory
• 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

Published

Mar 7, 2026

Last Modified

Jul 15, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-29180Fleet is open source device management software. Prior to 4.…8.8
• CVE-2026-29181OpenTelemetry-Go is the Go implementation of OpenTelemetry. …7.5
• CVE-2026-29182Parse Server is an open source backend that can be deployed …7.2
• CVE-2026-29183SiYuan is a personal knowledge management system. Prior to v…6.1
• CVE-2026-29184Backstage is an open framework for building developer portal…6.5
• CVE-2026-29185Backstage is an open framework for building developer portal…2.7
• CVE-2026-29187OpenEMR is a free and open source electronic health records …8.8
• CVE-2026-29188File Browser provides a file managing interface within a spe…8.1
• CVE-2026-29189SuiteCRM is an open-source, enterprise-ready Customer Relati…8.1
• CVE-2026-2919Malicious scripts could display attacker-controlled web cont…4.3
• CVE-2026-29190Karapace is an open-source implementation of Kafka REST and …5.3
• CVE-2026-29191ZITADEL is an open source identity management platform. From…9.3