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 exists in the OpenID Connect (OIDC) authentication flow: when OIDC is configured, SimpleHelp accepts identity tokens submitted during login without verifying their cryptographic signature. Because the application trusts unsigned or forged identity assertions, a remote unauthenticated attacker can submit a crafted token containing arbitrary identity claims and be logged in as a fully authenticated Technician user. The issue is rooted in improper validation of identity provider assertions/JWT signatures during OIDC processing, and in common deployments can result in creation or use of highly privileged Technician access. In some configurations, the flaw also undermines MFA protections because the downstream application accepts the forged token regardless of the identity provider’s authentication guarantees.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
58 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.