SimpleHelp Accepts Unverified Cryptographic Signatures, Letting Remote Attackers Bypass Authentication; CISA's July 2nd KEV Deadline for Covered Entities Has Passed

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2026-48558

Key Details

CVE	CVE-2026-48558
Vulnerability Name	SimpleHelp Authentication Bypass Vulnerability
Affected products	SimpleHelp SimpleHelp
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-347 (Improper Verification of Cryptographic Signature)
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-06-29.
Exploitation prediction (EPSS)	5.72% probability of exploitation in the next 30 days (93% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-07-02 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
SimpleHelp	SimpleHelp

Vendor

Product

Affected Versions

Patch Status

SimpleHelp

Subsystems	General OT
Sectors	Multiple

What to Know

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 to Do

Monitor SimpleHelp 's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-48558
CVE	https://www.cve.org/CVERecord?id=CVE-2026-48558

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-48558

CVE

https://www.cve.org/CVERecord?id=CVE-2026-48558

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-06-29
Required Action Due Date	2026-07-02
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.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-06-29

Required Action Due Date

2026-07-02

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.