CVE-2026-106488
Description
A flaw was found in plugin-auth-backend-module-oidc-provider. In deployments using email-based identity resolution with an OpenID Connect (OIDC) provider that allows unverified email addresses, an authenticated attacker can achieve privilege escalation by assuming another catalog identity. This allows the attacker to gain unauthorized access and permissions associated with the targeted user account.
Statement
Red Hat rates this vulnerability as Important severity because an authenticated remote user can impersonate other catalog accounts and obtain their elevated privileges, leading to significant confidentiality and integrity impact. Exploitation is constrained to environments where OpenID Connect (OIDC) authentication resolves identities via email claims while the external identity provider allows unverified addresses. Environments requiring verified email addresses or utilizing immutable subject identifiers for catalog mapping remain unaffected.
Mitigation
To mitigate this vulnerability without code modifications, apply either of the following operational or configuration controls:
1. Configure the external OpenID Connect (OIDC) identity provider to require verified email addresses before permitting user authentication.
2. Reconfigure the portal sign-in resolver to map users using immutable identifiers (such as the provider subject 'sub' claim) rather than email-based claims.
Caveats:
Enforcing email verification in the identity provider prevents users with unconfirmed addresses from logging in until verification is completed. Modifying sign-in resolver configurations in Red Hat Developer Hub requires restarting the service or container pod, which causes a temporary interruption in service availability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.1 | N/A | 8.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity
This weakness can allow an attacker to access resources which are not otherwise accessible without proper authentication.
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