CVE-2025-47729 identifies a vulnerability in the TeleMessage archiving backend, specifically related to the handling of messages from the TM SGNL (Archive Signal) app users. The core issue is that the backend stores cleartext copies of messages, which contradicts the vendor's documentation claiming end-to-end encryption from the mobile device through to the corporate archive. This discrepancy indicates the presence of hidden functionality (CWE-912) where the backend retains unencrypted message content, potentially exposing sensitive communications if the backend is accessed by unauthorized parties. The vulnerability was published on May 8, 2025, and affects versions up to the date of disclosure. The CVSS score is low (1.9), reflecting limited impact due to factors such as required local access (AV:L), high attack complexity (AC:H), and the need for high privileges (PR:H) without user interaction (UI:N). There are no known exploits in the wild, and no patches have been released at the time of publication. This vulnerability undermines the trust in TeleMessage's advertised end-to-end encryption, potentially exposing sensitive corporate communications stored in the archive backend to insider threats or attackers with privileged access.

For European organizations using TeleMessage's archiving backend, this vulnerability could lead to unauthorized disclosure of sensitive message content stored in cleartext. Although exploitation requires high privileges and local access, insider threats or attackers who gain administrative access could extract unencrypted communications, violating data protection regulations such as GDPR. This exposure risks confidentiality breaches, potential intellectual property loss, and reputational damage. The impact on integrity and availability is minimal, as the vulnerability does not allow message modification or service disruption. However, the breach of confidentiality alone is significant given the sensitivity of corporate communications and regulatory requirements in Europe. Organizations relying on TeleMessage for secure archiving should be aware that their data may not be as protected as advertised, potentially affecting compliance and trust with clients and partners.

European organizations should immediately audit access controls and monitor privileged user activities on the TeleMessage archiving backend to detect any unauthorized access attempts. Implement strict role-based access control (RBAC) and enforce the principle of least privilege to limit who can access the backend storage. Encrypt the storage volumes or databases at rest independently of the application to add an additional layer of protection for stored messages. Engage with TeleMessage to obtain timelines for patches or updates addressing this vulnerability and plan for prompt deployment once available. Consider implementing network segmentation to isolate the archiving backend from broader corporate networks, reducing the attack surface. Additionally, conduct regular security assessments and penetration tests focusing on backend storage security to identify and remediate any further hidden functionalities or misconfigurations. Finally, update incident response plans to include scenarios involving potential data exposure from this vulnerability.