CVE-2026-106556

high

Backstage is an open framework for building developer portals.

Vendor / product: Linuxfoundation — backstage

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.

CVSS

7.7

7.7 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (security-advisories@github.com)

Timeline (UTC)

Published: 2026-10-07 15:17

Modified: 2026-10-13 14:25

NVD status: Analyzed

Last synced 2 days ago

Verified against the source API 2026-10-27 06:58 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

linuxfoundation / backstage <1.50.5, ≥1.51.1 <1.54.6, 1.51.0

linuxfoundation / backstage_plugin-techdocs-node <1.14.6, ≥1.15.0 <1.15.4

Weakness classification (CWE)

CWE-78 CWE-184

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg

Patch / mitigation: https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26

Patch / mitigation: https://github.com/backstage/backstage/commit/b6d1aea0bef99b8dfec3c8746032474867ba677a

Patch / mitigation: https://github.com/backstage/backstage/releases/tag/v1.50.5

Patch / mitigation: https://github.com/backstage/backstage/releases/tag/v1.54.6

Patch / mitigation: https://github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg

References

https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26 security-advisories@github.com
https://github.com/backstage/backstage/commit/b6d1aea0bef99b8dfec3c8746032474867ba677a security-advisories@github.com
https://github.com/backstage/backstage/releases/tag/v1.50.5 security-advisories@github.com
https://github.com/backstage/backstage/releases/tag/v1.54.6 security-advisories@github.com
https://github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg security-advisories@github.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 06:58 UTC · record ↗

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CVE-2026-106556

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Weakness classification (CWE)

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