Prototype pollution in @backstage/plugin-catalog-backend

published 2024-09-17 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-2705 , GHSA-3x3f-jcp3-g22j

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits: 0; none known

Backstage is an open framework for building developer portals. A malicious actor with authenticated access to a Backstage instance with the catalog backend plugin installed is able to interrupt the service using a specially crafted query to the catalog API. This has been fixed in the `1.26.0` release of the `@backstage/plugin-catalog-backend`. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Patch / fix

fixed in 3

npm @backstage/plugin-catalog-backend 1.26.0
linuxfoundation @backstage/plugin-catalog-backend 1.26.0
linuxfoundation backstage_plugin-catalog-backend 1.26.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-45815 updated 2026-10-27 cvss 6.5

plugin-catalog-backend: prototype pollution vulnerability

Red Hat Developer Hub (RHDH) 1.4 rhdh 1.4-1734106454
fixed: vendor fix RHBA-2024:11265
Red Hat Developer Hub (RHDH) 1.4 rhdh 1.4-1734106469, rhdh 1.4-1734113472 Red Hat Developer Hub 1 rhdh-operator-container
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-09-18)

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	@backstage/plugin-catalog-backend	<1.26.0	1.26.0

Affected products

backstage backstage

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

github.com /backstage/backstage/security/advisories/GHSA-3x3f-jcp3-g22j
web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2024-45815
advisory
github.com /backstage/backstage
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary