CVE-2025-59894: Sync Breeze & Disk Pulse CSRF Vulnerability

CVE-2025-59894 Overview

CVE-2025-59894 is a Cross-Site Request Forgery (CSRF) vulnerability affecting Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18. The vulnerability allows an authenticated attacker to trick another authenticated user into performing unintended actions within the application. This security flaw exists due to the absence of proper CSRF token implementation across critical application endpoints.

Critical Impact

Attackers can leverage this vulnerability to force authenticated users to execute destructive operations, including the deletion of all commands via the /delete_all_commands endpoint, potentially causing significant data loss and operational disruption.

Affected Products

• Sync Breeze Enterprise Server v10.4.18
• Disk Pulse Enterprise v10.4.18
• Flexense Products (multiple products affected)

Discovery Timeline

• 2026-01-28 - CVE-2025-59894 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-59894

Vulnerability Analysis

This CSRF vulnerability stems from insufficient request validation in the web management interface of both Sync Breeze Enterprise Server and Disk Pulse Enterprise. When an authenticated user visits a malicious webpage crafted by an attacker, their browser can be coerced into sending authenticated requests to the vulnerable application without the user's knowledge or consent.

The lack of anti-CSRF tokens means the application cannot distinguish between legitimate user-initiated requests and forged requests originating from malicious third-party sites. This is particularly dangerous because the vulnerability affects administrative functionality, allowing attackers to manipulate critical system operations through social engineering tactics.

The vulnerability is exploitable over the network and requires the attacker to entice an authenticated victim to visit a malicious page. Once the victim loads the attacker-controlled content, their browser automatically includes session cookies with any requests made to the vulnerable application, effectively authenticating the malicious requests.

Root Cause

The root cause of CVE-2025-59894 is the absence of CSRF token validation in the application's request handling logic. Modern web applications typically generate unique, unpredictable tokens for each user session and require these tokens to be submitted with state-changing requests. The affected Flexense products fail to implement this security control, leaving authenticated sessions vulnerable to cross-origin request forgery attacks.

Without CSRF tokens bound to user sessions, the application has no mechanism to verify that incoming requests originate from legitimate user interactions within the application's own interface rather than from external, potentially malicious sources.

Attack Vector

The attack vector for this vulnerability involves network-based exploitation requiring user interaction. An attacker must craft a malicious webpage containing HTML forms or JavaScript that submits requests to the vulnerable Flexense application endpoints.

For successful exploitation, the attacker needs to:

1. Identify a victim who has an active authenticated session with the vulnerable application
2. Entice the victim to visit a webpage controlled by the attacker
3. The malicious page automatically submits requests to endpoints like /delete_all_commands?sid= using the victim's authenticated session

The vulnerability specifically allows POST requests to destructive endpoints. For example, an attacker can create an auto-submitting form targeting the /delete_all_commands endpoint, which when loaded by an authenticated victim, would delete all configured commands in the application.

Detection Methods for CVE-2025-59894

Indicators of Compromise

• Unexpected deletions or modifications of commands and configurations in Sync Breeze or Disk Pulse Enterprise without corresponding administrative activity
• Web server logs showing requests to /delete_all_commands or similar sensitive endpoints with referrer headers from external domains
• User reports of unauthorized changes occurring when browsing external websites while logged into the management interface

Detection Strategies

• Monitor web server access logs for requests to administrative endpoints (/delete_all_commands, configuration modification URLs) with suspicious or missing referrer headers
• Implement anomaly detection for unusual patterns of administrative actions, particularly bulk deletions or configuration changes
• Deploy web application firewall (WAF) rules to detect and alert on potential CSRF attack patterns targeting known vulnerable endpoints
• Review application audit logs for administrative actions that do not correlate with user-initiated activity in the management interface

Monitoring Recommendations

• Enable detailed logging on both Sync Breeze Enterprise Server and Disk Pulse Enterprise web interfaces to capture full request details including referrer headers
• Configure alerting for any access to destructive endpoints like /delete_all_commands to enable rapid incident response
• Implement session monitoring to detect unusual request patterns that may indicate CSRF exploitation attempts

How to Mitigate CVE-2025-59894

Immediate Actions Required

• Restrict access to the web management interface to trusted networks only using firewall rules or network segmentation
• Educate users with administrative access to avoid browsing untrusted websites while logged into the Flexense application management interfaces
• Consider disabling the web management interface entirely if not required and manage the applications through alternative methods
• Implement network-level access controls to limit which hosts can reach the administrative endpoints

Patch Information

At the time of publication, users should consult the INCIBE Multiple Vulnerabilities Notice for the latest information on available patches and vendor recommendations. Monitor Flexense product release notes for security updates addressing this CSRF vulnerability.

Organizations should prioritize upgrading to patched versions of Sync Breeze Enterprise Server and Disk Pulse Enterprise as soon as they become available from the vendor.

Workarounds

• Deploy a reverse proxy with CSRF protection capabilities in front of the vulnerable applications to add a security layer until official patches are available
• Restrict management interface access to localhost only and use SSH tunneling for remote administration
• Implement browser isolation for users who must access the management interface, preventing other browsing activity during administrative sessions
• Configure network firewalls to block external referrer requests to the management interface endpoints

# Example: Restrict access to management interface via iptables
# Allow only trusted management subnet to reach the application
iptables -A INPUT -p tcp --dport 80 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP

# Alternative: Use host-based firewall to limit access
# For Windows systems, configure Windows Firewall rules to restrict
# inbound connections to the web management port from trusted IPs only