High
Backstage: Improper authentication in the OIDC provider
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-106488
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 03:03 UTC · Revision 1
Source evidence
Backstage: Improper authentication in the OIDC provider
core-osv · Original sourcePublished 6 Oct 2026, 20:38 UTC
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.
osv:CVE-2026-106488
Complete source record
{
"id": "ebba3ebd934253059b0517431e464cfd7849f4ad3f17a8081f51e2a2ba0be976",
"url": "https://osv.dev/vulnerability/CVE-2026-106488",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Backstage: Improper authentication in the OIDC provider",
"summary": "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.",
"evidence": "osv:CVE-2026-106488",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-106488",
"aliases": [
"CVE-2026-106488",
"GHSA-826h-28h9-65hg"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
}
],
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{
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"modified": "2026-10-28T02:30:49.097145995Z",
"provider": "osv",
"references": [
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"https://github.com/backstage/backstage/security/advisories/GHSA-826h-28h9-65hg",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106488",
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"value": "CVE-2026-106488",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517597,
"published_at": "2026-10-06T20:38:18.045+00:00"
}