Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since June 29, 2026.
CVE-2026-48558
SimpleHelp Authentication Bypass Vulnerability
Added to KEV June 29, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-48558
- CWE
- CWE-347
- Affected products
- SimpleHelp · SimpleHelp SimpleHelp
What happened
SimpleHelp contains 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.
What it means for your business
SimpleHelp SimpleHelp is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-48558). SimpleHelp contains 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. CISA remediation due date: 2026-07-02. PremierePC tracks KEV alerts for Upstate SC businesses — patch or open a ticket if you need help verifying exposure.
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.
CISA due date: July 2, 2026
Sources
Related briefs
SimpleHelp Path Traversal Vulnerability
SimpleHelp SimpleHelp is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2024-57728). SimpleHelp contains a path traversal vulnerability that allows admin users to upload arbitrary files anywhere on the file system by uploading a crafted zip file (i.e. zip slip). This can be exploited to execute arbitrary code on the host in the context of the SimpleHelp server user. CISA remediation due date: 2026-05-08. If you need help checking exposure, call (864) 335-9223.
SimpleHelp Missing Authorization Vulnerability
SimpleHelp SimpleHelp is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2024-57726). SimpleHelp contains a missing authorization vulnerability that could allow low-privileged technicians to create API keys with excessive permissions. These API keys can be used to escalate privileges to the server admin role. CISA remediation due date: 2026-05-08. If you need help checking exposure, call (864) 335-9223.
SimpleHelp Path Traversal Vulnerability
SimpleHelp SimpleHelp is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2024-57727). SimpleHelp remote support software contains multiple path traversal vulnerabilities that allow unauthenticated remote attackers to download arbitrary files from the SimpleHelp host via crafted HTTP requests. These files may include server configuration files and hashed user passwords. CISA remediation due date: 2025-03-06. If you need help checking exposure, call (864) 335-9223.
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