CVE-2026-106498High· 7.7▾ Twilight

Backstage is an open framework for building developer portals

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score42/ 100 · Moderate

impact 42.4 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Oct 6, 2026

Updated

Oct 6, 2026

CVSS

7.7

Vendor

backstage

Product

backstage

CWE

CWE-863, CWE-918

Depth score

42 · Moderate

EPSS

—

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

backstage CWE-863 CWE-918 #nvd #cve.org

Affected

backstage < 1.49.6
backstage >= 1.50.0-next.0, < 1.50.5
backstage >= 1.51.0-next.0, < 1.51.3
backstage >= 1.52.0-next.0, < 1.53.2
backstage >= 1.54.0-next.0, < 1.54.6
plugin-catalog-backend < 3.5.1
plugin-catalog-backend >= 3.6.0, < 3.6.2
plugin-catalog-backend >= 3.7.0, < 3.7.2
plugin-catalog-backend >= 3.8.0, < 3.8.2
plugin-catalog-backend >= 3.9.0, < 3.9.1

Full technical detail▾

Overview

Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org