Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 1.14.6 and from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by an authenticated user who can register or modify a TechDocs source. Unsafe Python YAML tags, markdown_extensions names and configuration, theme options, and extra_templates values can reach the documentation generator and cause unintended code execution. The resulting impact is limited to the files, credentials, network access, and other resources available to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875
- https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1
- https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b7
- https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b0698
- https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a99
- https://github.com/backstage/backstage/releases/tag/v1.50.5
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- https://github.com/backstage/backstage/security/advisories/GHSA-292q-8mf5-h6g3
FAQ
What is CVE-2026-88064?
CVE-2026-88064 is a vulnerability with a CVSS score of 8.8 (HIGH). Backstage is an open framework for building developer portals. Prior to 1.14.6 and from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by...
How severe is CVE-2026-88064?
CVE-2026-88064 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-88064?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.