Vulnerability Analysis
SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
CVE-2026-48558
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.
CISA KEV
CVSS Base Score
9.5
CRITICAL
Exploitability:-
Impact Score:-
Temporal Score:-
EPSS:0.72%
Threat Intelligence Signals
CISA KEV
YES
KEV Date Added
2026-06-29
Ransomware Use
Unknown
KEV Due Date
2026-07-02
VulnCheck In-the-Wild
No
Nuclei Template
No
EPSS Score
0.721%
EPSS Percentile
49.3th pct
GHSA ID
GitHub Severity
CRITICAL
SSVC Exploitation
—
SSVC Automatable
—
Vulnerability Class
—
Identity & Timeline
| Status | - |
| Assigning Authority | - |
| CVSS Version / Source | - |
| Reserved | - |
| Published | - |
| Patch Date (date_public) | - |
| Exploit DB Date | - |
| First GitHub PoC Date | - |
| Last Updated | - |
| Time to Patch (Days to fix) | - |
| Exploit Release Gap | - |
| PoC Release Gap | - |
| Exploit DB References | None identified |
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| No affected products specified. | ||
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