External risk intelligence

Sungrow iSolarCloud Authentication Bypass Leads to Account Takeover

CVE advisorySeverity: CRITICAL (CVSS 9.2)

CVE-2026-107194

The vulnerability affects Sungrow iSolarCloud, which is a cloud-based monitoring and management platform for solar energy systems. As an internet-facing service designed for remote access to energy infrastructure, it is public-facing by design for users to monitor their systems, placing it in the category of services that are consistently deployed as public-facing endpoints.

Authentication Bypass

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory details a critical vulnerability in Sungrow's iSolarCloud platform that could allow unauthorized access to user accounts. The issue enables bypassing authentication, potentially leading to significant disruption of solar energy systems. The main concern is to confirm the relevance and exposure of this platform within our environment.

  • Authentication bypass could compromise user accounts.
  • Critical system access is at risk without authentication.
  • Confirm platform relevance and exposure in our systems.

Attack Path

How an attacker could exploit the issue

An attacker could bypass authentication on Sungrow iSolarCloud by sending a specially crafted login request. This allows them to gain unauthorized access to user accounts, potentially leading to significant disruption of energy infrastructure.

  • Internet access is required.
  • A specific login request triggers the vulnerability.
  • Account takeover and widespread power outages.

Live Threat

Current exploitation, exposure, and threat context

Authentication bypass in Sungrow iSolarCloud could allow unauthorized access to solar energy system controls. This could potentially impact service availability, leading to localized power disruptions when the affected systems are in use. The advisory notes that an email address is required for user accounts, and users can view the email address associated with their parent organization.

  • System access and control.
  • Unauthenticated access to user accounts.
  • Potential for localized blackouts.

Operational Fix

Recommended remediation, mitigation, and detection steps

Determining precise ownership requires understanding your deployment of Sungrow iSolarCloud. Typically, application owners or platform teams responsible for the iSolarCloud instance would lead the response. The first critical step is to identify all deployed instances, assess their exposure and business criticality, and locate the accountable party to initiate a coordinated remediation plan.

  • Identify affected systems and owners.
  • Verify instance reachability and criticality.
  • Plan and coordinate remediation actions.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is Sungrow iSolarCloud?

Sungrow iSolarCloud is a centralized cloud-based platform used to monitor, manage, and optimize solar energy systems. It allows operators and owners to track performance, view energy generation data, and interface with inverter hardware remotely.

What does CVE-2026-107194 mean?

This CVE represents an authentication bypass vulnerability, classified as CWE-288 (Authentication Bypass Using an Alternate Path or Channel). It means the system's security controls can be circumvented, allowing an unauthorized person to access user accounts without providing valid credentials.

How is this vulnerability triggered?

The flaw is triggered by sending a specific, crafted login request to the iSolarCloud platform containing a "login_type":"5" parameter. Simply browsing the site normally does not trigger it; the request must be intentionally modified to include this specific type to bypass the intended authentication logic.

Is my instance at risk?

Halo Surface Signal notes that iSolarCloud is an internet-facing service designed for remote monitoring, meaning it is public-facing by design. If you have an instance accessible over the internet, it falls into the category of services that are consistently exposed to external network traffic, increasing the relevance of this vulnerability.

Do I need to take action if I use this?

Yes. Start by identifying all instances of iSolarCloud deployed in your environment and confirm who owns or manages them. Once identified, assess the business criticality of those specific systems and coordinate with your platform teams to prioritize remediation steps.

References