Overview
This report provides an analysis of the vulnerability identified as CVE-2025-26842 which impacts the Znuny software up to version 7.1.3. This vulnerability allows unauthorized users to access the content of S/MIME encrypted emails. This security flaw poses a serious threat to the confidentiality and integrity of sensitive data, leading to potential system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-26842
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Unauthorized access to sensitive data and potential system compromise
Affected Products
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Product | Affected Versions
Znuny | Up to 7.1.3
How the Exploit Works
The exploit works by taking advantage of a flaw in Znuny’s security controls. If a user is not given access to a ticket, the content of S/MIME encrypted e-mail messages is visible in the CommunicationLog. This means that any unauthorized user with access to the CommunicationLog can view the content of encrypted email communications, potentially exposing sensitive information or leading to a system compromise.
Conceptual Example Code
While the exact code to exploit this vulnerability is not provided, a potential attacker might take advantage of the flaw by means of accessing the CommunicationLog. An example command to view the log might look like this:
cat /path/to/znuny/communication_logMitigation Guidance
To mitigate this vulnerability, users are advised to apply the latest vendor patches as soon as they are available. In the interim, the use of Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) can serve as temporary mitigation to prevent unauthorized access to the CommunicationLog. Regular monitoring and auditing of system logs can also aid in detecting any potential exploit attempts in a timely manner.
