What’s Vulnerable › Vulnerabilities

CVE-2026-48558: SimpleHelp Authentication Bypass Vulnerability

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-06-29
• EPSS: 77.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-12 · updated 2026-10-07
• Weakness: CWE-347

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

• Simplehelp: before 5.5.16; 6.0-pre-release — fixed in 5.5.16

How to fix

Upgrade to a fixed version: Simplehelp 5.5.16. Check the vendor advisory for mitigations.

References

• https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/
• https://simple-help.com/release-news
• https://simple-help.com/security/simplehelp-security-update-2026-05
• https://blackpointcyber.com/blog/a-djinn-in-the-machine-taskweavers-node-js-intrusion-chain/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48558

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