Authentication Bypass in SimpleHelp OIDC Authentication Flow
CVE-2026-48558 is a critical authentication bypass vulnerability affecting SimpleHelp versions 5.5.15 and earlier, as well as 6.0 pre-release versions. The flaw exists in the OpenID Connect (OIDC) authentication flow: when OIDC authentication is configured, SimpleHelp accepts submitted identity tokens during login without verifying their cryptographic signature. Because the token signature is not validated, a remote unauthenticated attacker can forge an identity token containing arbitrary identity claims and have it accepted as authentic. In vulnerable deployments, this allows the attacker to create or assume a fully authenticated technician session. The issue affects deployments using configured OIDC providers, including generic OIDC and Azure Active Directory OIDC, under configurations where technician group authenticated logins are enabled.
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Impact, mitigation & remediation
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical authentication bypass vulnerability in SimpleHelp's OIDC single sign-on authentication flow that allows unauthenticated attackers to submit identity tokens without signature verification, forge credentials, bypass MFA, and obtain administrative technician access for remote management of endpoints.
An authentication bypass vulnerability in SimpleHelp's OpenID Connect authentication handling that can allow an unauthenticated attacker to create and authenticate as a new Technician user, effectively bypassing MFA and gaining privileged management access.
An authentication bypass vulnerability in SimpleHelp's OIDC authentication flow that allows a remote unauthenticated attacker to forge identity tokens and obtain a fully authenticated technician session, potentially bypassing MFA in some configurations.
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.