CVE-2026-48558
10, critical Known exploitedSimpleHelp Authentication Bypass Vulnerability
- CVSS
- 10, critical critical CVSS v3.1
- EPSS, next 30 days
- 6% higher than 92.9% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 12 Jun 20264 months ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 29 Jun 2026. US federal agencies had to remediate by 2 Jul 2026, a deadline that has passed.
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.
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.
Details
- Vendor
- SimpleHelp
- Product
- SimpleHelp
- Weakness
- CWE-347 (opens in a new tab)
- Status
- Analyzed
- Updated
- 7 Oct 2026
- Assigner
- disclosure@vulncheck.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
References 5
Patches and fixes 1
Advisories 2
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other SimpleHelp CVEs
Every SimpleHelp CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2024-57726 SimpleHelp Missing Authorization Vulnerability KEV EPSS 67% 9.9, critical
- CVE-2024-57727 SimpleHelp Path Traversal Vulnerability KEV EPSS 97% 7.5, high
- CVE-2024-57728 SimpleHelp Path Traversal Vulnerability KEV EPSS 65% 7.2, high
Beyond this page
Is CVE-2026-48558 in your network?
This page tells you how dangerous CVE-2026-48558 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2026-48558 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
Find it before attackers do
Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-48558 comes with the devices to patch.
Learn more about EXYS7600 OCELOT -
EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
Learn more about EXYS7950 KONDRA
Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.