CVE-2026-106492

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Backstage is an open framework for building developer portals.

Vendor / product: Linuxfoundation — backstage\/backend-defaults

Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.

CVSS

6.5

6.5 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (nvd@nist.gov)

Timeline (UTC)

Published: 2026-10-06 21:17

Modified: 2026-10-22 13:40

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\/backend-defaults <0.16.1, ≥0.17.0 <0.17.8

linuxfoundation / backstage <1.49.6, ≥1.50.0 <1.54.6

Weakness classification (CWE)

CWE-269 CWE-863

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-cq7v-rfgc-5c7v

Patch / mitigation: https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124

Patch / mitigation: https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33

Patch / mitigation: https://github.com/backstage/backstage/releases/tag/v1.49.6

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

Patch / mitigation: https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v

References

https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124 security-advisories@github.com
https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33 security-advisories@github.com
https://github.com/backstage/backstage/releases/tag/v1.49.6 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-cq7v-rfgc-5c7v security-advisories@github.com

Data sources

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

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CVE-2026-106492

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Weakness classification (CWE)

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