Backstage: Improper URL validation in catalog entity placeholder resolution

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106498
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 22:17:04 UTC
Updated2026-10-09 02:17:00 UTC
DescriptionBackstage 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

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

EPSS: 0.003140000 probability, percentile 0.223370000 (date 2026-10-07)

Problem Types: CWE-863 | CWE-918 | CWE-863 CWE-863: Incorrect Authorization | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Backstage Backstage affected < 1.49.6 Not specified
CNA Backstage Backstage affected >= 1.50.0-next.0, < 1.50.5 Not specified
CNA Backstage Backstage affected >= 1.51.0-next.0, < 1.51.3 Not specified
CNA Backstage Backstage affected >= 1.52.0-next.0, < 1.53.2 Not specified
CNA Backstage Backstage affected >= 1.54.0-next.0, < 1.54.6 Not specified
CNA @backstage Plugin-catalog-backend affected < 3.5.1 Not specified
CNA @backstage Plugin-catalog-backend affected >= 3.6.0, < 3.6.2 Not specified
CNA @backstage Plugin-catalog-backend affected >= 3.7.0, < 3.7.2 Not specified
CNA @backstage Plugin-catalog-backend affected >= 3.8.0, < 3.8.2 Not specified
CNA @backstage Plugin-catalog-backend affected >= 3.9.0, < 3.9.1 Not specified

References

ReferenceSourceLinkTags
github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.50.5 [email protected] github.com
github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785b... [email protected] github.com
github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73 [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.53.2 [email protected] github.com
github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc659... [email protected] github.com
github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee631... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.49.6 [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.51.3 [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c439... [email protected] github.com
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