Detections
Analytics
SimpleHelp 5.5.x < 5.5.16 OIDC Authentication Bypass
critical Nessus Plugin ID 333310
Synopsis
The SimpleHelp instance running on the remote host is affected by an authentication bypass vulnerability.Description
The version of SimpleHelp running on the remote web server is 5.5.x prior to 5.5.16 (or a 6.0 pre-release prior to 6.0 RC2). It is, therefore, affected by 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, allowing privileged management activities such as remoting into managed endpoints and executing scripts. In some configurations this may also allow a bypass of multi-factor authentication. No user interaction is required.Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Upgrade to SimpleHelp version 5.5.16 / 6.0 RC2 or later to address this issue.See Also
https://simple-help.com/security/simplehelp-security-update-2026-05
Plugin Details
Severity: Critical
ID: 333310
File Name: simplehelp_cve-2026-48558.nasl
Version: 1.2
Type: Remote
Family: Web Servers
Published: 8/7/2026
Updated: 8/8/2026
Configuration: Enable paranoid mode
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Critical
Score: 9.3
Percentile: 99.81
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 8.3
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-48558
CVSS v3
Risk Factor: Critical
Base Score: 10
Temporal Score: 9.3
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C
CVSS v4
Risk Factor: Critical
Base Score: 9.5
Threat Score: 9.5
Threat Vector: CVSS:4.0/E:A
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
Vulnerability Information
CPE: x-cpe:/a:simplehelp:simplehelp
Required KB Items: Settings/ParanoidReport, installed_sw/SimpleHelp
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 6/9/2026
Vulnerability Publication Date: 6/12/2026
CISA Known Exploited Vulnerability Due Dates: 7/2/2026
Reference Information
CVE: CVE-2026-48558