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

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-48558.yaml

Associated Vulnerability

Title: SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification (CVE-2026-48558)
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.

Description

SimpleHelp <= 5.5.15 and 6.0 pre-release contain an authentication bypass caused by lack of cryptographic signature verification in OIDC tokens, letting remote unauthenticated attackers gain technician sessions, exploit requires OIDC authentication configured.

File Snapshot

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