CVE-2025-15070 is a vulnerability identified in Gmission Web Fax version 3.0, classified under CWE-200 (Exposure of Sensitive Information) and CWE-862 (Missing Authorization). The issue arises from inadequate authorization checks within the Web Fax application, allowing users with limited privileges (low-level authenticated users) to abuse authentication mechanisms and access sensitive information that should be restricted. This vulnerability does not require user interaction and does not affect the integrity or availability of the system, but it compromises confidentiality by exposing potentially sensitive fax data to unauthorized actors. The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N) indicates that exploitation requires local access with low privileges, no user interaction, and results in high confidentiality impact. The vulnerability affects only version 3.0 prior to 3.0.1, with no patches currently published and no known active exploits in the wild. The root cause is missing authorization controls that fail to properly restrict access to sensitive fax data, enabling privilege abuse within the application. This flaw could be exploited by insiders or attackers who have gained low-level access to the system, potentially leading to data leakage of confidential fax communications.

For European organizations, the exposure of sensitive fax data could lead to significant confidentiality breaches, especially in sectors such as healthcare, legal, finance, and government where fax communications often contain personally identifiable information (PII), financial data, or classified information. Unauthorized disclosure could result in regulatory non-compliance with GDPR and other data protection laws, leading to legal penalties and reputational damage. The requirement for local access with low privileges limits remote exploitation but does not eliminate risk, as insider threats or compromised user accounts could leverage this vulnerability. The absence of integrity or availability impact means operational disruption is unlikely, but the confidentiality breach alone is critical for organizations handling sensitive information. The lack of known exploits reduces immediate risk but should not delay remediation efforts. Organizations relying on Gmission Web Fax 3.0 must consider the potential for data leakage and the associated compliance and trust implications.

1. Immediately restrict local access to systems running Gmission Web Fax 3.0 to trusted personnel only, minimizing the risk of low-privilege abuse. 2. Implement strict access control policies and monitor user activities for unusual access patterns or attempts to access unauthorized fax data. 3. Employ network segmentation to isolate fax servers from general user networks, reducing the attack surface. 4. Enforce strong authentication and session management to prevent unauthorized privilege escalation. 5. Regularly audit and review user permissions to ensure least privilege principles are maintained. 6. Engage with Gmission for updates and apply patches promptly once version 3.0.1 or later is released addressing this vulnerability. 7. Consider deploying data loss prevention (DLP) solutions to detect and block unauthorized data exfiltration from fax systems. 8. Educate staff about insider threat risks and enforce policies to prevent misuse of legitimate access. 9. Maintain comprehensive logging and alerting on fax system access to facilitate rapid incident detection and response.