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CVE-2026-48558

SimpleHelp Authentication Bypass Vulnerability

SimpleHelp SimpleHelp CWE-347

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.

CVSS Score
10
Critical
EPSS — Exploit Probability
64%
Riskier than 99% of all CVEs · checked 2026-09-16
Exploitation
Confirmed in the wild
KEV since 2026-06-29
Remediation
Patch available
Federal deadline 2026-07-02
CISA 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. Deadline for federal agencies: 2026-07-02.

NVD entry Vendor patch PoC / advisory CISA KEV

11 articles across 8 outlets · first covered Jun 13, 2026 · latest Jul 6, 2026

Coverage timeline

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