CVE-2025-58866 is a vulnerability classified under CWE-497, which involves the exposure of sensitive system information to an unauthorized control sphere. This specific vulnerability affects the product 'Site Info' developed by Rami Yushuvaev, with versions up to 1.1 being impacted. The vulnerability allows an attacker to retrieve embedded sensitive data from the system. The CVSS 3.1 base score is 2.7, indicating a low severity level. The vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N reveals that the attack can be performed remotely over the network (AV:N) with low attack complexity (AC:L), but requires high privileges (PR:H) and no user interaction (UI:N). The scope remains unchanged (S:U), and the impact is limited to a low confidentiality impact (C:L) with no impact on integrity (I:N) or availability (A:N). No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability essentially leaks sensitive information embedded within the system, which could be leveraged by an attacker with high privileges to gain insights into system configuration or other sensitive details, potentially aiding further attacks or reconnaissance.

For European organizations, the impact of CVE-2025-58866 is relatively limited due to its low severity and the requirement for high privileges to exploit. However, exposure of sensitive system information can still pose risks, especially in environments where privilege escalation or insider threats are concerns. Attackers who have already gained elevated access could use this vulnerability to gather additional sensitive data, possibly facilitating lateral movement or targeted attacks. Organizations handling sensitive or regulated data (e.g., financial institutions, healthcare providers, or critical infrastructure operators) may find even low-level information disclosure problematic, as it could aid attackers in crafting more effective exploits or social engineering campaigns. The lack of impact on integrity and availability reduces the risk of direct disruption, but confidentiality breaches remain a concern, particularly under stringent European data protection regulations such as GDPR.

To mitigate this vulnerability, organizations should first ensure that access controls are strictly enforced to prevent unauthorized users from obtaining high privileges required for exploitation. Implementing the principle of least privilege and regularly auditing user permissions can reduce the risk. Since no patches are currently available, monitoring for updates from the vendor (Rami Yushuvaev) is critical to apply fixes promptly once released. Additionally, organizations should conduct thorough security assessments and penetration testing to detect any unintended information disclosures. Network segmentation and the use of intrusion detection systems can help identify and contain suspicious activities. Finally, sensitive data embedded within systems should be minimized or encrypted where possible to reduce the impact of any potential exposure.