CVE-2026-106488 Backstage @backstage/plugin-auth-backend-module-oidc-provider - Authentication Bypass

Backstage @backstage/plugin-auth-backend-module-oidc-provider < 0.4.20 contains an authentication bypass caused by improper handling of unverified email addresses in OIDC provider, letting authenticated provider users assume other catalog identities, exploit requires OIDC email-based identity resolution with unverified emails allowed.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.28% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
6 October 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Upgrade to version 0.4.20 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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