CVE-2025-63006 is a missing authorization vulnerability identified in the Metagauss EventPrime product, specifically within the eventprime-event-calendar-management module. The vulnerability arises due to incorrectly configured access control security levels, which fail to properly restrict actions to authorized users. This flaw affects all versions up to and including 4.2.4.1. An unauthenticated remote attacker can exploit this vulnerability by interacting with the event calendar management interface, potentially performing unauthorized modifications to event data or configurations. The CVSS 3.1 base score is 4.3 (medium), reflecting that the attack vector is network-based (AV:N), requires no privileges (PR:N), but does require user interaction (UI:R). The impact is limited to integrity (I:L) with no confidentiality (C:N) or availability (A:N) impact. No known exploits have been reported in the wild, and no official patches have been released as of the publication date. The vulnerability highlights a failure in enforcing proper authorization checks, allowing unauthorized users to bypass intended access restrictions. This could lead to unauthorized changes in event scheduling or management, which may disrupt organizational workflows or lead to misinformation. The vulnerability is classified under access control weaknesses but lacks a specific CWE identifier in the provided data. The issue was reserved in late October 2025 and published in December 2025, indicating recent discovery and disclosure.

For European organizations, the primary impact of CVE-2025-63006 is the potential unauthorized modification of event data within the EventPrime calendar management system. This can lead to misinformation, scheduling conflicts, or disruption of critical organizational events, affecting operational integrity. While confidentiality and availability are not directly impacted, the integrity compromise can indirectly affect business processes, internal communications, and coordination. Organizations relying heavily on EventPrime for event management, especially in sectors like government, education, and large enterprises, may experience workflow disruptions or reputational damage if attackers manipulate event information. The lack of authentication requirement lowers the barrier for exploitation, increasing risk exposure. However, the requirement for user interaction somewhat limits automated exploitation. Since no known exploits exist yet, the immediate risk is moderate but could escalate if weaponized. The absence of patches necessitates interim controls to mitigate potential exploitation. Overall, the vulnerability poses a moderate operational risk to European entities using affected versions of EventPrime.

1. Conduct an immediate audit of EventPrime access control configurations to identify and rectify any improperly set permissions or access levels within the event calendar management module. 2. Restrict network access to the EventPrime management interfaces using firewalls or VPNs, limiting exposure to trusted internal users only. 3. Implement strict monitoring and logging of all interactions with the event calendar system to detect unauthorized or suspicious activities promptly. 4. Educate users about the risk of interacting with unsolicited or suspicious links that could trigger exploitation attempts, given the user interaction requirement. 5. Engage with Metagauss support or vendor channels to obtain information on forthcoming patches or workarounds and apply them promptly once available. 6. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block anomalous requests targeting the event calendar management endpoints. 7. Develop and test incident response plans specific to unauthorized modifications in event management systems to ensure rapid containment and recovery. 8. If feasible, isolate EventPrime instances in segmented network zones to reduce lateral movement opportunities for attackers exploiting this vulnerability.