CVE-2025-58666 identifies a Missing Authorization vulnerability (CWE-862) in the Kommo Website Chat Button integration, specifically affecting versions up to 1.3.1. This vulnerability arises due to improperly configured access control mechanisms within the chat button integration, allowing users with limited privileges (requiring at least some level of authentication) to perform actions or access resources beyond their authorized scope. The CVSS 3.1 base score of 4.3 (medium severity) reflects that the vulnerability can be exploited remotely (AV:N) with low attack complexity (AC:L), requiring privileges (PR:L) but no user interaction (UI:N). The impact primarily affects integrity (I:L) without compromising confidentiality or availability. Since the vulnerability is related to missing authorization, an attacker with some level of authenticated access could manipulate or interfere with chat button functionalities, potentially altering data or configurations that should be restricted. No known exploits are currently reported in the wild, and no patches have been linked yet, indicating that organizations using this integration should proactively assess and mitigate the risk. The vulnerability is specific to the Kommo Website Chat Button integration, a tool used to embed chat functionalities on websites, which may be integrated into customer service or sales workflows.

For European organizations, the impact of this vulnerability could manifest as unauthorized modification of chat interactions, misconfiguration of chat settings, or manipulation of customer communication flows. This could lead to integrity issues such as altered messages, misleading customer interactions, or unauthorized changes to chat routing or data. While confidentiality and availability are not directly impacted, the integrity compromise could erode customer trust, damage brand reputation, and potentially lead to compliance issues under regulations like GDPR if personal data is mishandled or altered. Organizations relying on Kommo's chat integration for customer engagement, especially in sectors like e-commerce, finance, or telecommunications, may face operational disruptions or customer dissatisfaction. Since exploitation requires some level of authenticated access, insider threats or compromised user accounts pose a significant risk vector. The absence of known exploits suggests a window for remediation before active attacks emerge, but also highlights the need for vigilance.

European organizations should immediately review and audit access control configurations related to the Kommo Website Chat Button integration. Specific steps include: 1) Restricting user privileges to the minimum necessary, ensuring that only trusted and verified users have access to sensitive chat configuration functions; 2) Implementing robust authentication and session management controls to prevent unauthorized access; 3) Monitoring logs for unusual activities related to chat button configuration or usage; 4) Applying any available patches or updates from Kommo as soon as they are released; 5) If patches are not yet available, consider temporarily disabling or limiting the use of the chat button integration in critical environments; 6) Conducting penetration testing focused on access control to identify and remediate similar authorization weaknesses; 7) Training staff on secure usage practices and awareness of potential insider threats; 8) Reviewing integration points between Kommo and other systems to ensure no lateral escalation is possible. These targeted actions go beyond generic advice by focusing on the specific access control weakness and the operational context of the chat integration.