CVE-2026-48558

CVE Enrichment

CVSS: 9.5 CRITICAL
EPSS: 5.72%
EPSS Percentile: 92.86%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: disclosure@vulncheck.com
Published: 13-Jun-2026 01:16
Last Modified: 08-Oct-2026 03:17
EPSS Date: 2026-10-12
CWE: CWE-347

CVSS Vector


            CVSS:4.0                            AV:N /
                            AC:L /
                            AT:P /
                            PR:N /
                            UI:N /
                            VC:H /
                            VI:H /
                            VA:H /
                            SC:H /
                            SI:H /
                            SA:H /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

CISA KEV Details

Date Added: 2026-06-29
Remediation Due: 2026-07-02
Known Ransomware Campaign Use: Unknown
Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Notes: https://simple-help.com/security/simplehelp-security-update-2026-05 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-48558

Affected Products / Versions

simple-help / simplehelp
Version / affected range: * · before (exclusive) 5.5.16
cpe:2.3:a:simple-help:simplehelp:*:*:*:*:*:*:*:*
simple-help / simplehelp
Version / affected range: 6.0
cpe:2.3:a:simple-help:simplehelp:6.0:pre-release:*:*:*:*:*:*

References

Last enrichment sync: 13-Oct-2026 00:39
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (2)

CVE reference: CVE-2026-48558 Metasploit 6.5.4 Adds 16 Modules, Including Exploits for Five CISA KEV Vulnerabilities
CVE-2026-48558 Recorded Future Reported 59 High-Impact Vulnerabilities in June, 56 Actively Exploited

CVE (67)

Malware (6)

People (17)

Threat Actors (6)

Vendors (26)

Products (69)

Tools (3)

Industries (2)

Countries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.