CVE-2025-59892: Sync Breeze & Disk Pulse CSRF Vulnerability

CVE-2025-59892 Overview

CVE-2025-59892 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 user to manipulate another logged-in user into performing unintended actions within the application. This security flaw stems from the absence of proper CSRF token implementation, enabling attackers to craft malicious requests that execute privileged operations on behalf of legitimate users.

Critical Impact

Attackers can exploit this CSRF vulnerability to force authenticated users to delete commands via the /delete_command?sid= endpoint using the cid parameter, potentially leading to data loss and unauthorized system modifications.

Affected Products

• Sync Breeze Enterprise Server v10.4.18
• Disk Pulse Enterprise v10.4.18
• Flexense Products (as noted in the INCIBE advisory)

Discovery Timeline

• 2026-01-28 - CVE CVE-2025-59892 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-59892

Vulnerability Analysis

This Cross-Site Request Forgery vulnerability exists because the Sync Breeze Enterprise Server and Disk Pulse Enterprise applications fail to implement proper anti-CSRF protections. When a user is authenticated to the web management interface, the application does not validate the origin of requests or require unique tokens to verify that actions are intentionally initiated by the user.

The vulnerability is classified under CWE-352 (Cross-Site Request Forgery), which describes scenarios where a web application does not sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted it. In this case, the application accepts state-changing requests without validating their legitimacy through cryptographic tokens or other verification mechanisms.

The network-accessible nature of this vulnerability means attackers can exploit it remotely, though user interaction is required—specifically, the victim must click a malicious link or visit a compromised webpage while authenticated to the vulnerable application.

Root Cause

The root cause of CVE-2025-59892 is the complete absence of CSRF token implementation in the affected Flexense products. The web interface accepts POST requests to sensitive endpoints like /delete_command?sid= without requiring any form of request validation token. This design flaw allows attackers to craft malicious HTML pages or links that, when accessed by an authenticated user, automatically submit requests to the vulnerable server with the victim's session credentials.

Attack Vector

The attack vector for this vulnerability is network-based, requiring user interaction. An attacker would typically:

1. Craft a malicious webpage containing a hidden form or JavaScript that automatically submits a POST request to the vulnerable endpoint
2. Embed the cid parameter with the target command ID to be deleted
3. Distribute the malicious page via phishing emails, compromised websites, or social engineering
4. When an authenticated administrator visits the malicious page, the browser automatically sends the forged request with valid session cookies
5. The server processes the request as legitimate, executing the command deletion

The vulnerability specifically targets the /delete_command?sid= endpoint, but similar patterns may affect other administrative functions throughout the application where CSRF protections are absent.

Detection Methods for CVE-2025-59892

Indicators of Compromise

• Unexpected command deletions in Sync Breeze or Disk Pulse logs without corresponding user activity
• Web server logs showing POST requests to /delete_command?sid= with referrers from external domains
• Multiple rapid DELETE or modification operations occurring while users report not initiating them
• Session activity logs showing administrative actions during times when administrators were not actively using the system

Detection Strategies

• Monitor HTTP referrer headers for administrative endpoints—legitimate requests should originate from the application's own domain
• Implement web application firewall (WAF) rules to detect cross-origin POST requests to sensitive management endpoints
• Configure alert rules for bulk or rapid command deletions that deviate from normal operational patterns
• Enable verbose logging on the web management interface to capture request sources and timing

Monitoring Recommendations

• Deploy network monitoring to detect anomalous traffic patterns to Sync Breeze and Disk Pulse management interfaces
• Implement user behavior analytics to identify administrative actions that don't match typical user workflows
• Review access logs regularly for suspicious referrer patterns indicating potential CSRF exploitation attempts
• Configure SentinelOne agents to monitor process and network activity associated with Flexense products for signs of compromise

How to Mitigate CVE-2025-59892

Immediate Actions Required

• Restrict access to the web management interface to trusted networks only using firewall rules or network segmentation
• Implement reverse proxy authentication with additional CSRF protections in front of the vulnerable application
• Educate administrators about CSRF risks and the importance of not clicking links or visiting untrusted sites while authenticated
• Consider disabling the web interface entirely if it's not required for operations until a patch is available

Patch Information

No vendor patch information is currently available in the CVE data. Organizations should monitor the INCIBE Security Notice and vendor communications for updates regarding security fixes. Contact Flexense directly for patch availability and upgrade guidance.

Workarounds

• Deploy a web application firewall (WAF) with CSRF protection rules to filter malicious cross-origin requests
• Implement network-level access controls to limit management interface access to specific trusted IP addresses
• Use browser extensions or corporate policies that enforce same-origin restrictions for administrative interfaces
• Configure session timeouts to minimize the window of opportunity for CSRF attacks against authenticated sessions
• Consider implementing an upstream proxy that adds CSRF token validation for state-changing requests

# Example: Restrict access to management interface using iptables
# Allow only trusted management subnet
iptables -A INPUT -p tcp --dport 80 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP