High 7.7Published Oct 6, 2026

CVE-2026-106498Backstage: Improper URL validation in catalog entity placeholder resolution

Updated under an hour ago (Oct 28, 2026, 3:40 AM ET)

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It affects backstage and 3 other products. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.31%, higher than 23% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 7.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness (CWE): CWE-863, CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.31% (percentile 23)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

backstage backstage backstage:backstage (from the name)	before 1.49.6; from 1.50.0-next.0, < 1.50.5; from 1.51.0-next.0, < 1.51.3; from 1.52.0-next.0, < 1.53.2; from 1.54.0-next.0, < 1.54.6	CNA record
@backstage plugin-catalog-backend backstage:plugin_catalog_backend (from the name)	before 3.5.1; from 3.6.0, < 3.6.2; from 3.7.0, < 3.7.2; from 3.8.0, < 3.8.2; from 3.9.0, < 3.9.1	CNA record
linuxfoundation backstage_plugin-catalog-backend linuxfoundation:backstage_plugin-catalog-backend	before 3.5.1; from 3.6.0 before 3.6.2; from 3.7.0 before 3.7.2; from 3.8.0 before 3.8.2; from 3.9.0 before 3.9.1	NVD
linuxfoundation backstage linuxfoundation:backstage	before 1.49.6; from 1.50.0 before 1.50.5; from 1.51.0 before 1.51.3; from 1.52.0 before 1.53.2; from 1.54.0 before 1.54.6	NVD

References

References

https://github.com/backstage/backstage/security/advisories/GHSA-qgvj-qcf8-xq73	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/backstage/backstage/commit/0b0f6fc89b4eb4872c76a498abbe1dc65998bb6e	x-refsource-misc, patch
https://github.com/backstage/backstage/commit/286bfc1f9cc3608a073b41016be302785be385d1	x-refsource-misc, patch
https://github.com/backstage/backstage/commit/61a10f19926aeda7f4a32de48d733e6710584634	x-refsource-misc, patch
https://github.com/backstage/backstage/commit/99729e925fd2bd40ba210022351a0ee6318e6197	x-refsource-misc, patch
https://github.com/backstage/backstage/commit/e786ac309ed2d775daf2309393c015c43902d6f6	x-refsource-misc, patch
https://github.com/backstage/backstage/releases/tag/v1.49.6	x-refsource-misc, patch, release-notes
https://github.com/backstage/backstage/releases/tag/v1.50.5	x-refsource-misc, patch, release-notes
https://github.com/backstage/backstage/releases/tag/v1.51.3	x-refsource-misc, patch, release-notes
https://github.com/backstage/backstage/releases/tag/v1.53.2	x-refsource-misc, patch, release-notes
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.