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CVE-2026-48558: SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification

Critical · CVSS 10.0 (CVSS 3.1)KEV known exploitedEPSS 77.7%, 100th percentilePublished Updated Assigner: VulnCheck

In CISA’s Known Exploited Vulnerabilities catalog: SimpleHelp Authentication Bypass Vulnerability.

Added , federal remediation due . Known ransomware use: Unknown.

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Description

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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H · CWE-347

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

SimpleHelp: SimpleHelp

References

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