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Critical · 10.0 Known exploited Scanner template Public exploit CVE-2026-48558 EUVD-2026-36509GHSA-m93h-gjv2-fmq2

SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification

Published Jun 12, 2026 · Updated Oct 7, 2026 · Assigned by VulnCheck

Vendor: SimpleHelp Product: SimpleHelp

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.

Affected products

VendorProductAffectedFixed
SimpleHelp SimpleHelp 5.5.0 – < 5.5.16, 6.0 – < 6.0 RC2 5.5.16

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

Metasploit 1 module

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.

References