CVE-2026-107194 in iSolarCloud
Summary
by MITRE • 10/07/2026
Sungrow iSolarCloud before 2026 allows authentication bypass and account takeover via "login_type":"5" in a login request, potentially leading to "local blackouts on the whole continent" in Europe. An email address for the user_account property is required; however, a user can view the email address associated with their parent organization.
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified within Sungrow iSolarCloud prior to version 2026 represents a critical authentication bypass mechanism that stems from improper validation of login parameters in the application's backend logic. Specifically, the flaw is triggered when an attacker submits a login request containing the parameter "login_type" set to the value five. This specific input manipulates the internal authentication flow, allowing unauthorized access without valid credentials for the targeted account. The root cause lies in the server-side handling of this particular login type, which fails to enforce strict identity verification protocols or properly validate session tokens before granting access. By exploiting this logic error, an attacker can effectively bypass standard multi-factor or password-based authentication checks, leading directly to full account takeover capabilities.
The operational impact of this vulnerability extends far beyond individual user compromise due to the hierarchical nature of solar energy management systems and their integration with broader grid infrastructure. The iSolarCloud platform is widely used for monitoring and controlling photovoltaic installations across Europe and other regions. When an attacker gains control over a high-level administrative account or aggregates access through compromised lower-tier accounts, they can issue commands that affect connected inverters and power storage units. In extreme scenarios, malicious actors could manipulate the grid connection settings of numerous solar sites simultaneously. This capability creates a significant risk for coordinated attacks on energy infrastructure, potentially causing localized blackouts or destabilizing the local electrical grid by forcing sudden disconnections or erratic power output adjustments. The reference to potential continent-wide implications highlights the systemic risk posed when critical industrial control systems are compromised through web application vulnerabilities rather than direct network intrusion.
From an information disclosure perspective, the vulnerability is exacerbated by poor data isolation practices within the platform's user interface and API responses. While authentication bypass allows entry into a specific account, the system also exposes sensitive metadata regarding organizational structures. Specifically, users can view email addresses associated with their parent organization through standard queries or profile views that lack sufficient access control checks. This information leakage facilitates targeted social engineering attacks and aids in mapping out the attack surface of an organization's digital footprint. Attackers can use these disclosed emails to craft more convincing phishing campaigns aimed at other employees within the same corporate hierarchy, thereby increasing the likelihood of initial compromise even before exploiting the technical authentication flaw. The combination of data exposure and authentication bypass creates a potent vector for persistent unauthorized access.
This vulnerability aligns with several established industry standards regarding software security flaws. It is primarily classified under CWE-287, which denotes Improper Authentication, as the system fails to adequately verify identity during login attempts involving specific parameter values. Additionally, it falls under CWE-613, Insufficient Session Expiration, if the bypassed session remains active indefinitely without proper timeout mechanisms. In terms of offensive security frameworks, this exploit maps directly to MITRE ATT&CK technique T1078, Valid Accounts, where adversaries use legitimate credentials or compromised accounts to maintain access and move laterally within a network environment. The ability to view organizational data also relates to CWE-200, Exposure of Sensitive Information to an Unauthorized Actor, highlighting the need for stricter role-based access controls on metadata retrieval endpoints.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Organizations running versions of iSolarCloud prior to 2026 should apply vendor-provided patches immediately to address the flawed login_type handling logic. Security teams should also implement strict input validation on all authentication endpoints, ensuring that only expected values for login types are processed and that any anomalous inputs trigger secure failure modes rather than bypassing checks. Furthermore, access control lists must be reviewed to ensure that user accounts cannot retrieve sensitive organizational metadata such as parent email addresses unless explicitly authorized by their role level. Implementing multi-factor authentication across all administrative levels adds a critical layer of defense against account takeover attempts. Regular penetration testing and code reviews focusing on authentication flows are essential to identify similar logic flaws in other parts of the application before they can be exploited in production environments.