All vulnerabilities
CVE-2026-48558

SimpleHelp Authentication Bypass Vulnerability

SimpleHelp SimpleHelpApplications & CMS
Open in ThreatlineRecord JSON
CVSS
9.5Critical
ExploitationExploited in the wildAdded to KEV 29 Jun 2026CISA KEV
Exploit odds (EPSS)5.72%Chance of exploitation activity in the next 30 days, higher than 93% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in5.5.16Also 6.0 RC2CVE List
Federal deadline2 Jul 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply 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. CISA KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 12 Jun 2026Exploit code publicMetasploit
  2. 12 Jun 2026, 17:07 UTCPublishedCVE List
  3. 29 Jun 2026Added to CISA KEVCISA KEV

Public exploit code and templates 2

  • Exploit moduleSimpleHelp OIDC Authentication Bypass Remote Code Execution 12 Jun 2026Metasploit
  • Scanner templateSimpleHelp <=5.5.15 - OIDC JWT Authentication BypassNuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

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.

Text from CVE List

Affected versions 2

  • SimpleHelpaffected: 5.5.0 before 5.5.16CVE List
  • SimpleHelpaffected: 6.0 before 6.0 RC2CVE List

References 6