Detections
Analytics

SCA: security update for @backstage/plugin-catalog-backend (GHSA-w658-mh9p-ww8f)

medium Tenable Cloud Security Plugin ID 477767

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 3.9.2 and from 4.0.0 until 4.0.2,
 DefaultCatalogRulesEnforcer in @backstage/plugin-catalog-backend compares the raw location.target URL
 against catalog.rules, while URL readers canonicalize the same URL before fetching it. An authenticated
 user with catalog.location.create permission can use percent-encoded path segments to make an untrusted
 URL match a trusted location pattern even though the canonical URL resolves outside that scope. This
 admits entity content from an untrusted source as trusted, while further downstream consequences depend on
 deployment configuration. This issue is fixed in versions 3.9.2 and 4.0.2. (CVE-2026-115923)

Solution

Update the @backstage/plugin-catalog-backend library and its related packages to version 3.9.2 or later.

See Also

https://github.com/advisories/GHSA-w658-mh9p-ww8f

Plugin Details

Severity: Medium

ID: 477767

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 10/29/2026

Updated: 10/29/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-115923

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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: 10/28/2026

Vulnerability Publication Date: 10/26/2026

Reference Information

CVE: CVE-2026-115923

cwe: CWE-22