CVE-2026-106488

highpriority · track · 0EPSS 0.003 · 20 %ileUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.28% (20th) EPSS

CVSS 8.1 · high

Is it mine?

3 products

Check your exposure

Who says so?

2 sources

nvd · osv

EPSS · scored 2026-10-27

Backstage is an open framework for building developer portals. Prior to 0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package is affected by improper authentication in the oidc provider. Deployments using OIDC email-based identity resolution with a provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity. This may grant access and permissions associated with that user. No direct availability impact is demonstrated. This issue is fixed in version 0.4.20.

cvss

Technical severity, 0–10. One row per scoring source.

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 5.2

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · OSV

v3.17.4highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USCWE-287US

affected products (3)

Products and version ranges known to be affected.

linuxfoundation backstage< 1.54.6nvdUScpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
linuxfoundation backstage/plugin-auth-backend-module-oidc-provider< 0.4.20nvdUScpe:2.3:a:linuxfoundation:backstage\/plugin-auth-backend-module-oidc-provider:*:*:*:*:*:*:*:*
npm @backstage/plugin-auth-backend-module-oidc-provider< 0.4.20osvUSpkg:npm/%40backstage/plugin-auth-backend-module-oidc-provider

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-826h-28h9-65hgBackstage: Improper authentication in the OIDC provider2026-10-07ghsa · osvUS
### Impact Deployments using OIDC email-based identity resolution with a provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity. This may grant access and permissions associated with that user. No direct availability impact is demonstrated. ### Patches Patched in `@backstage/plugin-auth-backend-module-oidc-provider` version `0.4.20`. ### Workarounds - Disable email-based sign-in resolution for the OIDC provider, or require the identity provider to verify email addresses before allowing sign-in.

sources

Which sources assert this record, and when.

nvd osv NVD CVE.org MITRE

published 2026-10-06modified 2026-10-22

references (3) nvd

External citations — patches, advisories, analysis.

https://github.com/backstage/backstage/commit/1b1f05e82161aaabc226c1d7d498d746956bf942Patch
https://github.com/backstage/backstage/releases/tag/v1.54.6PatchRelease Notes
https://github.com/backstage/backstage/security/advisories/GHSA-826h-28h9-65hgMitigationVendor Advisory

scry

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