CVE-2026-88064Backstage: Improper input validation in TechDocs MkDocs configuration
Updated under an hour ago ()
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It affects backstage and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-20, CWE-1336
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
backstage backstage backstage:backstage (from the name) | before 1.14.6; from 1.15.0, < 1.15.4 | CNA record |
linuxfoundation backstage_plugin-techdocs-node linuxfoundation:backstage_plugin-techdocs-node | before 1.14.6; from 1.15.0 before 1.15.4 | NVD |
linuxfoundation backstage linuxfoundation:backstage | before 1.14.6; from 1.15.0 before 1.15.4 | NVD |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-292q-8mf5-h6g3x-refsource-confirm, mitigation, vendor-advisory
- https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29x-refsource-misc, patch
- https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbbx-refsource-misc, patch
- https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26x-refsource-misc, patch
- https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9x-refsource-misc, patch
- https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9dx-refsource-misc, patch
- https://github.com/backstage/backstage/releases/tag/v1.50.5x-refsource-misc, patch, release-notes
- https://github.com/backstage/backstage/releases/tag/v1.54.6x-refsource-misc, patch, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.