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 | Jul 14, 2026 |
⚠️ Actively Exploited — Act Now
Get instant alerts for simplehelp simplehelp
This vulnerability is actively exploited in the wild. Set up free real-time alerts so you're first to know about threats like CVE-2026-48558.
Get Free Alerts →
Free · No credit card · 60 sec setup
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
horizon3.ai: https://horizon3.ai/attack-research/disclosures/cve-2026-48558-simplehelp-authentication-bypass-iocs/ simple-help.com: https://simple-help.com/security/simplehelp-security-update-2026-05 simple-help.com: https://simple-help.com/release-news blackpointcyber.com: https://blackpointcyber.com/blog/a-djinn-in-the-machine-taskweavers-node-js-intrusion-chain/ cisa.gov: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48558
Credits
Zach Hanley (@hacks_zach) of Horizon3.ai