CVE-2026-106491
6.4
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Exploitability: 3.1 / Impact: 2.7
Source: security-advisories@github.com (Secondary)
Description
Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to a path outside the configured base path on the target server. This is limited to target servers already configured as proxy endpoints and requires Backstage authentication by default. This issue is fixed in version 0.6.17.
Affected (2)
Products: Linuxfoundation: Backstage/plugin Proxy Backend, Backstage
Configuration A
| Vulnerable Software | Affected Versions |
|---|---|
| version < 0.6.17 |
Configuration B
| Vulnerable Software | Affected Versions |
|---|---|
| version < 1.54.6 |
Related CWEs
CWE-20
Improper Input Validation
The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.
CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
References (3)
Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
PatchRelease Notes
Source: security-advisories@github.com
MitigationVendor Advisory
Timeline
No history available yet.