CVE-2025-60936 is a cross-site scripting (XSS) vulnerability identified in Emoncms version 11.7.3, an open-source energy monitoring and data visualization platform. The vulnerability arises from insufficient input sanitization in the application's input handling mechanism, specifically within the API accessible to authenticated users. Attackers with valid API credentials can inject malicious JavaScript code into input fields or data submitted to the system. This malicious script is then stored and executed in the context of the administrator's browser when they view the application logs, which display the injected content. This stored XSS attack vector enables attackers to hijack administrator sessions, steal cookies or tokens, perform actions on behalf of the admin, or pivot further into the network. The attack requires the attacker to have authenticated API access, which limits exploitation to insiders or attackers who have compromised legitimate credentials. No public exploits or proof-of-concept code have been reported yet, and no official patch or CVSS score is currently available. The vulnerability was reserved on 2025-09-26 and published on 2025-10-24. The lack of a CVSS score necessitates an independent severity assessment based on the attack vector, impact, and exploit complexity.

For European organizations using Emoncms, particularly in sectors such as energy management, utilities, or smart building monitoring, this vulnerability poses a significant risk. Successful exploitation could lead to administrative account compromise, allowing attackers to manipulate monitoring data, disrupt operations, or exfiltrate sensitive information. The stored XSS could also facilitate lateral movement within the network if attackers leverage admin privileges. Confidentiality and integrity of monitoring data are at risk, potentially affecting operational decisions and compliance with data protection regulations like GDPR. Availability impact is indirect but possible if attackers disrupt or manipulate system logs or monitoring functions. The requirement for authenticated API access reduces the likelihood of external exploitation but raises concerns about insider threats or credential compromise. European organizations with weak API access controls or insufficient monitoring are particularly vulnerable.

To mitigate this vulnerability, organizations should immediately review and restrict API access permissions, ensuring only trusted users have authenticated access. Implement strict input validation and output encoding on all API inputs to prevent injection of malicious scripts. Administrators should be cautious when viewing logs and consider isolating log viewing interfaces or using hardened browsers with script-blocking extensions. Monitoring and alerting on unusual API activity or log content changes can help detect exploitation attempts. Applying any forthcoming patches from Emoncms promptly is critical. Additionally, enforcing multi-factor authentication (MFA) for API users and rotating API keys regularly will reduce the risk of credential compromise. Network segmentation to limit access to the Emoncms API and logs can further reduce exposure. Finally, conducting security awareness training for users with API access about the risks of XSS and credential security is recommended.