CVE-2025-7974: Rocket.chat Information Disclosure Flaw

CVE-2025-7974 Overview

CVE-2025-7974 is an Incorrect Authorization vulnerability affecting Rocket.Chat installations that enables remote attackers to disclose sensitive information without authentication. The vulnerability exists within the web service, which listens on TCP port 3000 by default, and stems from improper authorization checks that allow unauthorized access to sensitive application data.

This vulnerability was reported through the Zero Day Initiative (ZDI) program and tracked as ZDI-CAN-26517.

Critical Impact

Unauthenticated remote attackers can access and exfiltrate sensitive information from Rocket.Chat deployments, potentially exposing confidential communications, user data, and organizational information without any authentication requirements.

Affected Products

• Rocket.Chat (all versions prior to patched release)

Discovery Timeline

• September 02, 2025 - CVE-2025-7974 published to NVD
• January 27, 2026 - Last updated in NVD database

Technical Details for CVE-2025-7974

Vulnerability Analysis

This vulnerability falls under CWE-863 (Incorrect Authorization), where the application fails to properly verify whether a user has the necessary permissions to access specific resources or functionality. In the case of CVE-2025-7974, the Rocket.Chat web service does not adequately enforce authorization controls, allowing unauthenticated users to access information that should be restricted.

The flaw enables attackers to bypass authentication mechanisms entirely and retrieve sensitive data directly from the application context. Since the vulnerability requires no user interaction and can be exploited remotely over the network with low attack complexity, it presents a significant risk to organizations running vulnerable Rocket.Chat instances.

Root Cause

The root cause of this vulnerability is inadequate authorization enforcement within the Rocket.Chat web service. Specifically, certain API endpoints or resources fail to validate whether incoming requests originate from authenticated and authorized users before returning sensitive information. This allows attackers to craft requests that bypass normal access controls and retrieve data they should not have permission to access.

Attack Vector

The attack vector is network-based, targeting the Rocket.Chat web service on TCP port 3000 (the default listening port). An attacker can exploit this vulnerability remotely without requiring any authentication credentials or user interaction.

The exploitation workflow involves:

1. Identifying a vulnerable Rocket.Chat instance accessible over the network
2. Sending crafted requests to the web service endpoints that lack proper authorization checks
3. Receiving sensitive information in the application response that should be protected by access controls

For detailed technical information about this vulnerability, refer to the Zero Day Initiative Advisory ZDI-25-627.

Detection Methods for CVE-2025-7974

Indicators of Compromise

• Unusual or excessive API requests to Rocket.Chat endpoints from unauthenticated sources
• Anomalous data access patterns in application logs, particularly requests retrieving user or message data without valid session tokens
• Network traffic to TCP port 3000 from unexpected external IP addresses
• Log entries showing successful data retrieval responses without corresponding authentication events

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block suspicious request patterns targeting Rocket.Chat API endpoints
• Configure intrusion detection systems (IDS) to alert on unauthenticated access attempts to the Rocket.Chat service
• Enable detailed access logging on the Rocket.Chat web service and correlate authentication events with data access requests
• Deploy network monitoring to identify unusual traffic volumes or patterns to TCP port 3000

Monitoring Recommendations

• Continuously monitor Rocket.Chat application logs for access requests that lack valid authentication tokens
• Set up alerts for data exfiltration indicators such as large response payloads to unauthenticated requests
• Review audit logs regularly for unauthorized information access attempts
• Implement real-time monitoring of network connections to Rocket.Chat instances from external sources

How to Mitigate CVE-2025-7974

Immediate Actions Required

• Restrict network access to Rocket.Chat instances by limiting exposure to trusted networks and implementing firewall rules
• Place Rocket.Chat deployments behind a reverse proxy with additional authentication requirements
• Enable and review all available access logging to identify potential exploitation attempts
• Consider temporarily taking publicly accessible Rocket.Chat instances offline until patches can be applied

Patch Information

Organizations should monitor the official Rocket.Chat security advisories and apply patches as soon as they become available. Refer to the Zero Day Initiative Advisory ZDI-25-627 for the latest information on patch availability and remediation guidance.

Workarounds

• Implement network segmentation to restrict access to Rocket.Chat services from untrusted networks
• Deploy a web application firewall (WAF) in front of Rocket.Chat to filter malicious requests and enforce additional access controls
• Configure reverse proxy authentication to add an extra layer of access verification before requests reach the Rocket.Chat service
• Limit access to TCP port 3000 through firewall rules, allowing connections only from known and trusted IP addresses

# Example: Restrict access to Rocket.Chat service using iptables
# Allow access only from trusted network range
iptables -A INPUT -p tcp --dport 3000 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 3000 -j DROP

# Alternative: Use UFW (Uncomplicated Firewall)
ufw allow from 10.0.0.0/8 to any port 3000
ufw deny 3000