CVE-2026-106499

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Backstage is an open framework for building developer portals.

Vendor / product: Linuxfoundation — backstage\/plugin-scaffolder-backend

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.

CVSS

4.9

4.9 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (security-advisories@github.com)

Timeline (UTC)

Published: 2026-10-06 22:17

Modified: 2026-10-15 02:16

NVD status: Analyzed

Last synced 2 days ago

Verified against the source API 2026-10-27 06:58 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

linuxfoundation / backstage\/plugin-scaffolder-backend <4.1.0

linuxfoundation / backstage <1.54.6

Weakness classification (CWE)

CWE-532

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/backstage/backstage/security/advisories/GHSA-mfvq-x7vr-rgqg

Patch / mitigation: https://github.com/backstage/backstage/commit/dc30fae2d96cb1606d36cc40b242f9b9e539bd70

Patch / mitigation: https://github.com/backstage/backstage/releases/tag/v1.54.6

Patch / mitigation: https://github.com/backstage/backstage/security/advisories/GHSA-mfvq-x7vr-rgqg

References

https://github.com/backstage/backstage/commit/dc30fae2d96cb1606d36cc40b242f9b9e539bd70 security-advisories@github.com
https://github.com/backstage/backstage/releases/tag/v1.54.6 security-advisories@github.com
https://github.com/backstage/backstage/security/advisories/GHSA-mfvq-x7vr-rgqg security-advisories@github.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 06:58 UTC · record ↗

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CVE-2026-106499

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Weakness classification (CWE)

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References

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