Detections
Analytics

SCA: security update for @backstage/plugin-proxy-backend (GHSA-9ghw-48h5-v2w5)

medium Tenable Cloud Security Plugin ID 473664

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-106491)

Solution

Update the @backstage/plugin-proxy-backend library and its related packages to version 0.6.17 or later.

See Also

https://github.com/advisories/GHSA-9ghw-48h5-v2w5

Plugin Details

Severity: Medium

ID: 473664

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 10/7/2026

Updated: 10/7/2026

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 10.07

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

CVSS Score Source: CVE-2026-106491

CVSS v3

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.6

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/7/2026

Vulnerability Publication Date: 10/6/2026

Reference Information

CVE: CVE-2026-106491