CVE-2026-2737: Progress Flowmon CSRF Vulnerability

CVE-2026-2737 Overview

A Cross-Site Request Forgery (CSRF) vulnerability exists in Progress Flowmon network monitoring and analytics platform. This vulnerability affects Progress Flowmon versions prior to 12.5.8 and 13.0.6, whereby an administrator who clicks a malicious link provided by an attacker may inadvertently trigger unintended actions within their authenticated web session.

Critical Impact

Authenticated administrators can be tricked into performing unintended actions through malicious links, potentially leading to unauthorized configuration changes, data manipulation, or compromise of network monitoring infrastructure.

Affected Products

• Progress Flowmon versions prior to 12.5.8
• Progress Flowmon versions prior to 13.0.6

Discovery Timeline

• 2026-04-02 - CVE-2026-2737 published to NVD
• 2026-04-02 - Last updated in NVD database

Technical Details for CVE-2026-2737

Vulnerability Analysis

This vulnerability is classified as CWE-79, which typically relates to Cross-Site Scripting; however, the behavior described aligns with Cross-Site Request Forgery (CSRF) characteristics. The vulnerability exploits the trust relationship between the authenticated administrator's browser and the Progress Flowmon web application.

When an authenticated administrator clicks a malicious link crafted by an attacker, the browser automatically includes session credentials with the forged request. Since the Flowmon application fails to properly validate request origins or implement anti-CSRF tokens, the application processes these forged requests as legitimate administrative actions.

The network attack vector means exploitation can occur remotely, requiring only that the victim administrator be authenticated and click or visit an attacker-controlled resource. Given that Progress Flowmon is a network monitoring solution typically deployed in enterprise environments, successful exploitation could provide attackers with the ability to modify monitoring configurations, create blind spots in network visibility, or leverage the monitoring infrastructure for further attacks.

Root Cause

The root cause of this vulnerability is the absence of proper CSRF protection mechanisms in the Progress Flowmon web application. The application fails to implement adequate request validation, such as synchronizer tokens or same-site cookie attributes, allowing attackers to forge requests that appear legitimate to the server. This enables state-changing operations to be triggered through cross-origin requests when an authenticated user interacts with malicious content.

Attack Vector

The attack requires user interaction from an authenticated administrator. An attacker would craft a malicious webpage, email, or link containing forged requests targeting the Progress Flowmon management interface. When an administrator with an active session visits the malicious content, their browser automatically sends the authenticated request to the Flowmon application.

The attack can be delivered through various channels including phishing emails with embedded links, malicious advertisements on legitimate websites, or compromised web pages that the target administrator may visit. The attack does not require any special positioning within the network, as it leverages the administrator's own browser and credentials to execute the malicious actions.

Detection Methods for CVE-2026-2737

Indicators of Compromise

• Unexpected configuration changes in Progress Flowmon without corresponding administrator activity logs
• Referrer headers in web server logs showing external domains for state-changing requests
• Administrative actions occurring at unusual times or from unexpected source IP addresses
• User reports of clicking links shortly before unexplained system modifications

Detection Strategies

• Review web server access logs for administrative endpoints accessed with external or missing referrer headers
• Implement monitoring for configuration changes in Progress Flowmon and correlate with administrator login sessions
• Deploy web application firewalls (WAF) with CSRF detection rules to identify potentially forged requests
• Monitor for patterns of administrative actions that occur without corresponding UI navigation sequences

Monitoring Recommendations

• Enable verbose logging on Progress Flowmon administrative interfaces to capture request origins
• Implement SIEM correlation rules to detect administrative actions that lack proper session initiation patterns
• Configure alerts for configuration modifications during non-business hours or from unusual network segments
• Periodically audit Flowmon configurations against known-good baselines to detect unauthorized changes

How to Mitigate CVE-2026-2737

Immediate Actions Required

• Upgrade Progress Flowmon to version 12.5.8 or later for the 12.x branch
• Upgrade Progress Flowmon to version 13.0.6 or later for the 13.x branch
• Advise administrators to avoid clicking links from untrusted sources while authenticated to Flowmon
• Consider using dedicated browsers or private browsing sessions for administrative access to Flowmon

Patch Information

Progress has released security updates addressing this vulnerability. Organizations running affected versions should upgrade to Progress Flowmon 12.5.8 or 13.0.6 as appropriate for their deployment. For detailed patch information and upgrade instructions, refer to the Progress Flowmon CVE-2026-2737 Advisory.

Workarounds

• Implement network segmentation to restrict access to the Flowmon management interface from trusted networks only
• Configure same-site cookie policies at the reverse proxy or load balancer level if supported
• Require administrators to log out of Flowmon sessions when not actively in use to reduce the attack window
• Deploy a web application firewall with CSRF protection rules in front of the Flowmon interface as a defense-in-depth measure