SimpleHelp OIDC Authentication Bypass
CVE-2026-48558 is a critical authentication bypass vulnerability in SimpleHelp affecting versions 5.5.15 and earlier and 6.0 pre-release versions. The flaw is in the OpenID Connect (OIDC) authentication flow: when OIDC is configured, SimpleHelp accepts submitted identity tokens during login without verifying their cryptographic signature. Because the application trusts unsigned or improperly validated identity assertions, a remote unauthenticated attacker can forge a token containing arbitrary identity claims and have it accepted as valid. In vulnerable deployments, this allows the attacker to create or obtain a fully authenticated Technician session without possessing legitimate credentials. Reporting also indicates the issue affects common OIDC integrations, including generic OIDC and Azure AD OIDC, and stems from improper validation of identity provider assertions/JWT signature verification.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
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Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
61 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical authentication bypass vulnerability in SimpleHelp that can allow unauthenticated creation of highly privileged technician accounts on servers using OIDC, enabling compromise of the RMM platform and downstream managed systems.
A critical authentication bypass vulnerability in SimpleHelp Server deployments using OpenID Connect (OIDC) authentication that allows unauthenticated attackers to create a Technician account, bypass MFA, and gain elevated access to managed endpoints and administrative functions.
A critical authentication bypass vulnerability in SimpleHelp affecting deployments configured to use OpenID Connect (OIDC) authentication, allowing unauthenticated remote attackers to create a forged Technician account, bypass MFA on first login, and gain remote access to managed endpoints.
An authentication bypass vulnerability in SimpleHelp OIDC authentication that can allow forged identity tokens to be accepted, enabling unauthorized technician access.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.