CVE entry · CVE-2026-48558
CVE-2026-48558: SimpleHelp Authentication Bypass Vulnerability
SimpleHelp contains 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.
- Actively exploited: added to CISA’s KEV catalog on June 29, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: July 2, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes SimpleHelp SimpleHelp, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
Other SimpleHelp vulnerabilities
-
CVE-2024-57728Used by ransomwareSimpleHelp Path Traversal Vulnerability
-
CVE-2024-57726Used by ransomwareSimpleHelp Missing Authorization Vulnerability