CVE-2026-48558
CWE-347Published: June 12, 2026· Updated: Jun 30, 2026
Official 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.
Risk Analysis
This critical vulnerability in SimpleHelp versions 5.5.15 and prior, and 6.0 pre-release versions, allows an unauthenticated attacker to bypass OIDC authentication. By submitting a forged identity token, an attacker can gain a fully authenticated technician session, potentially bypassing multi-factor authentication. The CVSS score of 10.0 indicates maximum severity and immediate attention is required.
This vulnerability is actively being exploited in the wild and is listed in CISA's KEV catalog. It is remotely exploitable with low attack complexity and requires no user interaction.
Upgrade SimpleHelp to a patched version beyond 5.5.15 or 6.0 pre-release. Ensure OIDC configurations are correctly verifying cryptographic signatures of identity tokens.
Technical Analysis
CVE-2026-48558 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
CISA has added CVE-2026-48558 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
News & Research Mentioning CVE-2026-48558
An unknown threat actor has been observed exploiting a recently disclosed maximum-severity security flaw in SimpleHelp to deliver two previously unreported malware families, TaskWeaver and Djinn Stealer. The intrusion involves the exploitation of CVE-2026-48558 (CVSS score: 10.0), a critical authentication bypass vulnerability impacting the OpenID Connect (OIDC) flow that an unauthenticated [xlite_meta score:53 src:The Hacker News xlite_fp:a9de9987162dfc7ad2d599b16d57bd337018450691a7b62236aacc828cf94b7e]
The infostealer was delivered via CVE-2026-48558, a critical authentication bypass vulnerability in SimpleHelp, targeting credentials linking development and admin environments to wider enterprise systems.
Hackers are exploiting a recently disclosed critical vulnerability (CVE-2026-48558) in SimpleHelp to deploy Djinn Stealer, a previously undocumented cross-platform information stealer targeting Windows, macOS, and Linux. [...] [xlite_meta score:64 src:BleepingComputer xlite_fp:fe4cc96a3d003101862bce2cbafa5fe5e7a919808c24a54d5d7501dd60a435f6]
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-48558 SimpleHelp Authentication Bypass Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CI [xlite_meta score:48 src:CISA Alerts xlite_fp:a92b3344636b20418025a9319f34715074ef47954fb7d5d8c9abb4c547529f2d]
All References (5)
Quick Facts
Related CVEs (CWE-347)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-48558 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1