CVE-2026-48558
SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
CVSS Score
10.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-347 |
| Vendor | simplehelp |
| Product | simplehelp |
| Published | Jun 12, 2026 |
| Last Updated | Jun 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
SimpleHelp / SimpleHelp
5.5.0 < 5.5.16 6.0 < 6.0 RC2
References
Credits
Zach Hanley (@hacks_zach) of Horizon3.ai