CVE-2026-48558 KEV
10.0
CRITICAL · CVSS 3.1 · EPSS 5.7% (pctl 93)
Patch first
On CISA KEV — known exploited in the wild, due 2026-07-02.
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.
Scoring
| CVSS | 10.0 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 5.72% — more likely to be exploited than 93% of all CVEs |
| Weakness | CWE-347 |
| On CISA KEV | yes — remediate by 2026-07-02 |
| Public exploit | none known |
| Published | 2026-06-12 |
| Last modified | 2026-06-30 |
CISA KEV
| Name | SimpleHelp Authentication Bypass Vulnerability |
|---|---|
| Added | 2026-06-29 |
| Due | 2026-07-02 |
| Vendor / product | SimpleHelp / SimpleHelp |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| simple-help | simplehelp |
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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