SimpleHelp up to 5.5.15/6.0 RC1 Multi-Factor Authentication signature verification

Summaryinfo

A vulnerability classified as critical was found in SimpleHelp up to 5.5.15/6.0 RC1. Affected by this vulnerability is an unknown functionality of the component Multi-Factor Authentication. Executing a manipulation can lead to signature verification. This vulnerability appears as CVE-2026-48558. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in SimpleHelp up to 5.5.15/6.0 RC1 and classified as critical. This vulnerability affects an unknown function of the component Multi-Factor Authentication. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication is configured, identity tokens submitted during login are accepted without verifying their cryptographic signature. In a vulnerable configuration, a remote, unauthenticated attacker can submit a forged token containing arbitrary identity claims to obtain a fully authenticated technician session. In some configurations, this may also allow bypass of multi-factor authentication. No user interaction is required.

The advisory is available at horizon3.ai. This vulnerability was named CVE-2026-48558 since 05/21/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 5.5.16 or 6.0 RC2 eliminates this vulnerability.

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Productinfo

Name

• SimpleHelp

Version

• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3
• 5.5.4
• 5.5.5
• 5.5.6
• 5.5.7
• 5.5.8
• 5.5.9
• 5.5.10
• 5.5.11
• 5.5.12
• 5.5.13
• 5.5.14
• 5.5.15
• 6.0 RC1

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