External risk intelligence

Output Messenger Directory Traversal Vulnerability.

CVE advisoryKnown Exploit

CVE-2025-27920

A directory traversal vulnerability in Output Messenger allows attackers to access sensitive files outside intended directories. This impacts organizations by enabling unauthorized access to configuration details and other critical data, posing a significant business risk.

4Halo Surface Signal

Path Traversal

Srimax Output Messenger

before 2.0.63

External exposure likelihood

Halo Surface Signal score for CVE-2025-27920

Output Messenger is an enterprise communication and collaboration platform designed to support remote teams and interconnected offices. As a messaging server that facilitates real-time communication across distributed environments, it is commonly deployed as an internet-reachable service to enable external connectivity for remote users.

Horizon Alert

Summary of the vulnerability and why it matters

Output Messenger is vulnerable due to improper file path handling, which allows for directory traversal. This weakness means attackers can access sensitive files outside of the designated directories. The potential impact includes unauthorized access to configuration details and other sensitive data.

  • Vulnerable component: Output Messenger
  • Core weakness: Improper file path handling
  • Main business impact: Sensitive data exposure

Attack Path

How an attacker could exploit the issue

The vulnerability allows an attacker to access sensitive files outside the intended directory through improper file path handling. By manipulating specific parameters, an attacker could potentially gain unauthorized access to configuration details or other critical files. This could lead to further compromise of the affected systems and data.

  • Network exposure required.
  • Unauthenticated access triggers impact.
  • File access and configuration leakage.

Live Threat

Current exploitation, exposure, and threat context

A directory traversal vulnerability in Output Messenger could allow unauthorized access to sensitive files. This could lead to the leakage of configuration details or the retrieval of arbitrary files, posing a significant risk to organizational data. The vulnerability has been observed in exploitation.

  • Likely attacker skill level: Moderate
  • Required access or conditions: Network access, low privileges
  • Business risk or urgency: High, requires immediate attention

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

The identified vulnerability presents a directory traversal risk within Output Messenger versions prior to 2.0.63. Attackers can exploit this by manipulating file paths to access sensitive information or configuration files outside the designated directories. This could result in unauthorized data exposure and potential compromise of system configurations.

  • Identify all instances of Output Messenger.
  • Isolate affected systems or restrict network access.
  • Apply vendor updates and validate remediation.
  • Monitor for anomalous activity.

Frequently asked questions

What is the Output Messenger directory traversal vulnerability?

Output Messenger, versions before 2.0.63, is susceptible to a directory traversal attack due to inadequate handling of file paths. Attackers can exploit this by using sequences like '../' in parameters to navigate beyond the intended directories, potentially accessing and exfiltrating sensitive files.

How does the improper file path handling in Output Messenger lead to a weakness?

The core weakness lies in Output Messenger's improper file path handling (CWE-22). This allows an attacker to manipulate input parameters to traverse directory structures, enabling them to access files and directories outside of the web root or intended scope, leading to unauthorized data disclosure.

What is the trigger path and scope for this Output Messenger vulnerability?

The trigger path involves an attacker sending specially crafted requests with directory traversal sequences (e.g., '../') within parameters. The scope is limited to accessing files on the server's file system that are accessible by the Output Messenger application, potentially including sensitive configuration files or user data.

What is the relevance of the Output Messenger vulnerability, and why is it significant?

This vulnerability (CVE-2025-27920) is significant because it allows an authenticated attacker with low privileges to access sensitive files and configurations via network. Its inclusion in the CISA Known Exploited Vulnerabilities (KEV) catalog highlights its exploitation in the wild, posing a high risk of sensitive data exposure and potential system compromise.

What practical steps should be taken to address the Output Messenger directory traversal vulnerability?

To address this vulnerability, organizations should immediately update Output Messenger to version 2.0.63 or later. If an update is not feasible, network access to the affected instances should be restricted. Continuous monitoring for unusual file access patterns or suspicious activity is also recommended.

References