CVE-2026-106494

Backstage: Improper input validation in cloud storage URL readers

State: Published
Severity: 4.4 Medium
Published: Oct 6, 2026
Updated: Oct 7, 2026
Reserved: Oct 6, 2026

Description

Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. This issue is fixed in version 0.17.8.

Scores

CVSS	Score	Vector	Source
3.1	4.4 Medium	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-73 External Control of File Name or Path

Affected Products

Product	Versions
backstagebackstage	< 1.54.6Affected
backend-defaults@backstage	< 0.17.8Affected

References

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