Authentication Bypass in SimpleHelp via Unverified OIDC Tokens

Executive Summary

CVE-2026-48558 is an authentication bypass vulnerability in SimpleHelp versions 5.5.15 and earlier, as well as 6.0 pre-release versions, that affects the OpenID Connect (OIDC) authentication flow.

When OIDC authentication is enabled, the system accepts identity tokens during login without verifying their cryptographic signature. This flaw allows a remote, unauthenticated attacker to submit a forged token with arbitrary identity claims and gain a fully authenticated technician session.

In some configurations, this vulnerability can also bypass multi-factor authentication (MFA), and no user interaction is required for exploitation.

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Compliance Impact

The vulnerability allows a remote, unauthenticated attacker to bypass authentication and potentially multi-factor authentication, gaining privileged access as a technician. This unauthorized access could lead to exposure or manipulation of sensitive data managed through SimpleHelp, which may impact compliance with data protection regulations such as GDPR and HIPAA that require strict access controls and protection of personal and health information.

Because the vulnerability undermines authentication mechanisms, organizations using affected versions of SimpleHelp may face increased risk of data breaches or unauthorized access, which are critical compliance concerns under these standards.

Mitigation through timely updates and patches is essential to maintain compliance and reduce the risk of regulatory violations.

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Impact Analysis

This vulnerability allows an unauthenticated attacker to gain privileged access to the SimpleHelp system by impersonating a technician user.

• The attacker can bypass authentication mechanisms, including multi-factor authentication.
• The attacker can obtain a fully authenticated technician session, potentially allowing control over remote monitoring and management functions.
• This can lead to unauthorized access to sensitive systems and data managed through SimpleHelp.
• Indicators of compromise include unfamiliar technician accounts appearing in the administrator panel.

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Detection Guidance

This vulnerability can be detected by checking for unfamiliar technician accounts or email addresses in the SimpleHelp administrator panel. Specifically, navigate to Administration -> Technicians -> Gear Icon -> "Show Group Authenticated Users" to identify any suspicious or unauthorized technician logins.

Detection involves verifying if the server is configured with OIDC authentication enabled, if at least one TechnicianGroup is associated with the OIDC provider, and if "Allow group authenticated logins" is enabled on the TechnicianGroup, as these conditions make the server vulnerable.

No specific network or system commands are provided in the available resources for direct detection of this vulnerability.

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Mitigation Strategies

The immediate and recommended step to mitigate this vulnerability is to update SimpleHelp to the latest secure versions: SimpleHelp 5.5.16 for version 5.5.x users and SimpleHelp 6.0 RC2 for version 6.0 users.

As a temporary mitigation, applying IP restrictions to limit access to trusted networks can help reduce the risk of exploitation.

Administrators should also review and tighten configuration settings related to OIDC authentication and TechnicianGroup permissions to reduce exposure.

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