CVE-2026-106505 — Backstage is an open framework for building developer portals.
Description
Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4.
CVSS v3.1 base metrics
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:LHigh severity
Band computed from the CVSS base score, not the source's own label — so it means the same thing across every feed.
AV
Network
Attack Vector
AC
High
Attack Complexity
PR
Low
Privileges Required
UI
None
User Interaction
S
Changed
Scope
C
High
Confidentiality
I
Low
Integrity
A
Low
Availability
Affected
- Vendor
- npm
- Product
- @backstage/plugin-techdocs-node
Versions
- pkg:npm/%40backstage/plugin-techdocs-node < 1.15.4
Stated as the source expressed them.
References
- otherOSV webhttps://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9
- otherOSV webhttps://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db
- otherOSV webhttps://github.com/backstage/backstage/releases/tag/v1.50.5
- otherOSV webhttps://github.com/backstage/backstage/releases/tag/v1.54.6
- otherOSV webhttps://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx
- advisoryOSV GHSA-p75x-jh7p-ppcxhttps://osv.dev/vulnerability/GHSA-p75x-jh7p-ppcx
- advisoryOSV advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-106505
- vendorOSV packagehttps://github.com/backstage/backstage
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