VULNERABILITY INTELLIGENCE
CVE-2026-48558
CVSS score9.5 CRITICAL
EPSS probability77.66%
CISA KEVKnown exploited vulnerability
Published2026-06-12
Last modified2026-10-07
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Known Exploited Vulnerability
SimpleHelp Authentication Bypass Vulnerability
Vendor / product: SimpleHelp / SimpleHelp
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 classification
- CWE-347: Improper Verification of Cryptographic Signature
Primary references
- disclosure@vulncheck.com — Third Party Advisory
- disclosure@vulncheck.com — Release Notes
- disclosure@vulncheck.com — Patch, Vendor Advisory
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Technical Description, Third Party Advisory
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 — US Government Resource