CVE-2026-106501

Backstage: Sensitive information exposure in Scaffolder

At a glance

Severity: CRITICAL 9.6
EPSS: EPSS 0.48 % · percentile 41 (2026-10-27)
State: PUBLISHED
Published: 2026-10-06
Updated: 2026-10-07
Assigner: GitHub_M
NVD status: Analyzed

Description

Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N	GitHub_M
CVSS 3.1	CRITICAL 9.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N	NVD · security-advisories@github.com (Secondary)

Weaknesses (CWE)

Advisories

GHSA-g2v8-7jhw-pp8p — Backstage: Sensitive information exposure in Scaffolder

European references

ENISA EUVD · EUVD-2026-94059
GCVE · GCVE-0-2026-106501

Affected configurations (NVD CPE)

cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:* < 3.3.1
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:* ≥ 3.4.0 < 3.4.1
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:* ≥ 4.0.0 < 4.0.3
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:* ≥ 4.0.4 < 4.1.0
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* < 1.49.6
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* ≥ 1.50.0 < 1.50.5
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* ≥ 1.51.0 < 1.54.6

Affected products

Product	Versions
backstage · backstage	affected < 1.49.6 ; affected >= 1.50.0-next.0, < 1.50.5 ; affected >= 1.51.0-next.0, < 1.54.6
@backstage · plugin-scaffolder-backend	affected < 3.3.1 ; affected >= 3.4.0, < 3.4.1 ; affected >= 4.0.0, < 4.0.3 ; affected >= 4.0.4, < 4.1.0

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD