CVE-2025-36756 is a medium severity vulnerability affecting the SolaX Cloud platform, which is used to manage SolaX Power solar panel inverters. The core issue is a missing authorization control (CWE-862) that allows an attacker to take over any SolaX solar panel inverter if they know the inverter's serial number. This vulnerability arises from improper enforcement of authorization checks, enabling unauthorized users with limited privileges (PR:L) to perform actions that should be restricted. The vulnerability does not require user interaction (UI:N) and can be exploited remotely over the network (AV:N) with low attack complexity (AC:L). The CVSS 4.0 vector indicates partial attack complexity but requires some privileges and authentication (AT:P), though the authorization flaw effectively bypasses intended access controls. The scope is high (S: H), meaning the vulnerability can affect components beyond the initially compromised component, and the impact on confidentiality, integrity, and availability is direct (V:D, I:N, A:N). The vulnerability specifically impacts versions of SolaX Cloud before June 27, 2025. No known exploits are currently in the wild, and no patches have been linked yet. The vulnerability is related to CWE-862 (missing authorization) and CWE-306 (missing authentication), indicating systemic access control weaknesses. This flaw could allow attackers to manipulate inverter settings, disrupt solar power generation, or potentially cause physical damage or safety risks by controlling inverter operations remotely. Given the critical role of solar inverters in energy infrastructure, this vulnerability poses a significant risk to energy reliability and operational safety for affected users.

For European organizations, especially those involved in renewable energy generation, this vulnerability could have substantial operational and financial impacts. Solar power plants and distributed solar installations managed via SolaX Cloud could be compromised, leading to unauthorized control over energy production and potential disruption of power supply. This could affect energy providers, commercial solar farm operators, and residential users relying on SolaX inverters. The ability to take over inverters remotely could also lead to safety hazards, equipment damage, or manipulation of energy output, undermining trust in renewable energy infrastructure. Additionally, attackers might leverage compromised inverters as entry points into broader industrial control or energy management networks, increasing the risk of cascading failures or data breaches. The medium CVSS score reflects moderate ease of exploitation but significant impact on availability and operational integrity. Given the increasing reliance on solar energy in Europe’s green energy transition, this vulnerability could hinder energy resilience and regulatory compliance for affected entities.

Organizations using SolaX Cloud should immediately verify their version and update to the latest patched version once available, ideally after June 27, 2025, when the fix is expected. Until patches are released, organizations should restrict network access to the SolaX Cloud management interfaces, implementing network segmentation and firewall rules to limit exposure. Employ strong monitoring and anomaly detection on inverter management traffic to identify unauthorized access attempts. Validate and audit all user privileges and access controls within the SolaX Cloud platform to minimize the risk of privilege escalation. Consider implementing compensating controls such as multi-factor authentication (MFA) for all users with access to inverter management and enforce strict logging and alerting on configuration changes. Engage with SolaX Power support for guidance and early access to patches or mitigations. Additionally, organizations should conduct security assessments of their solar infrastructure to identify other potential vulnerabilities and ensure comprehensive protection of critical energy assets.