Detections
Analytics

SCA: security update for @backstage/plugin-proxy-backend (GHSA-472h-9c5j-prrr)

medium Tenable Cloud Security Plugin ID 473782

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. From 0.5.0 until 0.6.18, the
 @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping
 proxy routes. An operator can configure overlapping proxy paths with different credential requirements.
 When a parent path permits unauthenticated access and a nested path requires credentials, the parent
 exemption can also cover requests handled by the nested proxy. An unauthenticated caller may therefore
 reach the nested upstream through Backstage, including with static upstream credentials configured for
 that proxy. This issue is fixed in version 0.6.18. (CVE-2026-106456)

Solution

Update the @backstage/plugin-proxy-backend library and its related packages to version 0.6.18 or later.

See Also

https://github.com/advisories/GHSA-472h-9c5j-prrr

Plugin Details

Severity: Medium

ID: 473782

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 10/8/2026

Updated: 10/8/2026

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 8.14

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2026-106456

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/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-2026-106456

cwe: CWE-863