Overview
CVE-2025-59025 describes a medium-severity security vulnerability affecting the Open-Xchange App Suite. This vulnerability allows attackers to execute arbitrary script code by crafting malicious email content. Successfully exploiting this flaw can lead to unintended actions being performed within the context of the user’s account, including the exfiltration of sensitive information.
Technical Details
The vulnerability stems from insufficient sanitization of email content within the Open-Xchange App Suite. Specifically, the App Suite fails to properly neutralize potentially malicious scripts embedded within the HTML body of an email. By crafting a specially designed email, an attacker can bypass existing security measures and inject code that will be executed when the user views the email. This code could perform actions such as:
- Stealing user credentials or session cookies.
- Modifying or deleting emails and other data within the user’s account.
- Sending spam or phishing emails to other users.
- Potentially gaining unauthorized access to other applications integrated with the App Suite.
The updated sanitization routines address these bypasses, strengthening the system’s defense against malicious email content.
CVSS Analysis
The Common Vulnerability Scoring System (CVSS) provides a standardized method for assessing the severity of security vulnerabilities. CVE-2025-59025 has a CVSS score of 6.1 (MEDIUM).
This score reflects the following characteristics:
- Attack Vector (AV): Network (N) – The vulnerability can be exploited remotely over a network.
- Attack Complexity (AC): Low (L) – The conditions for exploitation are easily met.
- Privileges Required (PR): None (N) – No special privileges are required to exploit the vulnerability.
- User Interaction (UI): Required (R) – User interaction (viewing the malicious email) is required for the vulnerability to be exploited.
- Scope (S): Changed (C) – An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component.
- Confidentiality Impact (C): Low (L) – There is limited loss of confidentiality.
- Integrity Impact (I): Low (L) – There is limited modification of integrity.
- Availability Impact (A): None (N) – There is no impact to availability.
Possible Impact
Successful exploitation of CVE-2025-59025 can have several negative consequences:
- Data Breach: Sensitive information, such as emails, contacts, and documents, could be exfiltrated from the user’s account.
- Account Compromise: An attacker could gain complete control of the user’s account, allowing them to impersonate the user and perform unauthorized actions.
- Spam and Phishing Campaigns: The attacker could use the compromised account to send spam or phishing emails to other users, potentially spreading malware or stealing more credentials.
- Reputational Damage: If a large number of accounts are compromised, the organization using Open-Xchange App Suite could suffer significant reputational damage.
Mitigation and Patch Steps
The primary mitigation step is to update your Open-Xchange App Suite installation to the latest version containing the fix for CVE-2025-59025. Open-Xchange has released a patch that addresses the insufficient sanitization of email content.
- Apply the Patch: Download and install the latest security patch from Open-Xchange as soon as possible. Consult the official Open-Xchange documentation for detailed instructions.
- Verify the Installation: After applying the patch, verify that the vulnerability has been successfully mitigated by testing with benign, but potentially suspicious, email content.
- Monitor for Suspicious Activity: Continuously monitor your Open-Xchange App Suite environment for any unusual activity, such as suspicious logins, unauthorized access attempts, or data exfiltration.
- Educate Users: Educate users about the risks of opening suspicious emails and clicking on links from unknown senders.
