CVE-2026-48558 SimpleHelp Authentication Bypass

Exploited in the wild Critical 9.5 Published 12 Jun 2026 Updated 7 Oct 2026

Remote attackers can bypass authentication in SimpleHelp by submitting forged OIDC tokens when OIDC is configured, gaining technician access.

Exploited in the wild: Since 29 Jun 2026
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-48558?

CVE-2026-48558 is a critical authentication bypass vulnerability in SimpleHelp, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-347

Which versions are affected by CVE-2026-48558?

It affects 1 product.

Products include Simple-Help Simplehelp.

How do I fix CVE-2026-48558?

No fix has been published for CVE-2026-48558 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 2 Jul 2026.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-48558 being exploited?

Yes. Attackers have exploited CVE-2026-48558 in the wild since at least 29 Jun 2026.

Public exploit code: 1 Metasploit module, 1 Nuclei template and 1 proofs of concept on GitHub.

Sources

Also known as GHSA-m93h-gjv2-fmq2.