CVE-2026-32650: Anviz CrossChex Information Disclosure

CVE-2026-32650 Overview

CVE-2026-32650 is a cryptographic vulnerability affecting Anviz CrossChex Standard, a time and attendance management solution. The vulnerability exists in the TDS7 PreLogin process where an attacker can manipulate the protocol handshake to disable encryption. This causes database credentials to be transmitted in plaintext over the network, enabling unauthorized database access and potential data exfiltration.

This weakness falls under CWE-757 (Selection of Less-Secure Algorithm During Negotiation), where the application fails to properly enforce secure communication during the initial connection negotiation phase.

Critical Impact

Database credentials transmitted in plaintext allow attackers to gain unauthorized access to backend databases, potentially exposing sensitive employee data, access control records, and authentication information stored within the CrossChex system.

Affected Products

• Anviz CrossChex Standard (specific versions not disclosed)

Discovery Timeline

• April 17, 2026 - CVE-2026-32650 published to NVD
• April 20, 2026 - Last updated in NVD database

Technical Details for CVE-2026-32650

Vulnerability Analysis

The vulnerability resides in the TDS7 (Tabular Data Stream version 7) protocol implementation used by Anviz CrossChex Standard for database communication. During the PreLogin phase of connection establishment, the protocol negotiates encryption capabilities between the client and server. An attacker positioned on the network can intercept and modify this negotiation to force the connection to proceed without encryption.

When encryption is disabled during this phase, all subsequent communication—including database authentication credentials—is transmitted in plaintext. This allows an attacker to capture sensitive credentials through passive network sniffing or active man-in-the-middle attacks. The captured credentials can then be used to directly access the database, bypassing application-level access controls entirely.

The attack is network-based and requires no authentication or user interaction, making it particularly dangerous in environments where the CrossChex Standard application communicates over untrusted network segments.

Root Cause

The root cause of this vulnerability is the application's failure to enforce mandatory encryption during the TDS7 PreLogin negotiation. The software accepts downgraded connection parameters that disable encryption rather than requiring encrypted communication as a non-negotiable requirement. This selection of a less-secure algorithm during negotiation (CWE-757) allows attackers to force the use of insecure plaintext communication.

Attack Vector

The attack vector is network-based, requiring the attacker to be positioned between the CrossChex Standard application and its database server. The attacker performs a man-in-the-middle attack during the TDS7 PreLogin phase, intercepting the encryption negotiation packets and modifying them to indicate that encryption should not be used. Once the connection proceeds without encryption, the attacker can passively capture database credentials as they are transmitted in cleartext.

The exploitation mechanism involves intercepting the PreLogin packet exchange and manipulating the encryption option bytes to disable TLS/SSL protection. This attack does not require any privileges and can be executed without user interaction.

Detection Methods for CVE-2026-32650

Indicators of Compromise

• Unencrypted TDS traffic on port 1433 or non-standard database ports used by CrossChex Standard
• Network captures showing plaintext SQL Server authentication attempts
• Anomalous database access patterns from unexpected source IP addresses
• Failed or successful database authentication attempts from hosts that should not have direct database access

Detection Strategies

• Deploy network monitoring to detect unencrypted TDS protocol traffic between CrossChex clients and database servers
• Implement database activity monitoring to identify authentication attempts from unauthorized sources
• Configure IDS/IPS rules to alert on TDS PreLogin packets with encryption disabled flags
• Monitor for credential-based database access originating from network segments where such access should not occur

Monitoring Recommendations

• Enable TDS protocol inspection on network security appliances positioned between application and database tiers
• Configure SIEM alerts for database authentication events that do not correspond to expected application server connections
• Implement network segmentation monitoring to detect lateral movement attempts using captured credentials
• Review database audit logs for access patterns inconsistent with normal application behavior

How to Mitigate CVE-2026-32650

Immediate Actions Required

• Isolate Anviz CrossChex Standard installations to trusted network segments with strict access controls
• Implement network-level encryption (IPsec or VPN tunneling) between the application and database servers as an interim measure
• Review database server configurations to require encrypted connections (Force Encryption setting in SQL Server)
• Audit database access logs for evidence of unauthorized access using compromised credentials

Patch Information

Vendor patch information is not currently available in the CVE data. Organizations should contact Anviz directly for remediation guidance. For the latest information, refer to the CISA ICS Advisory ICSA-26-106-03 and the Anviz contact page to inquire about security updates.

Additional technical details may be found in the GitHub CSAF Incident Report.

Workarounds

• Configure the SQL Server database to force encryption for all connections, rejecting any connection attempts that do not use TLS
• Implement network segmentation to ensure CrossChex application-to-database communication occurs only on isolated, trusted network segments
• Deploy host-based firewalls on database servers to restrict incoming connections to known application server IP addresses
• Consider implementing database proxy solutions that can enforce encrypted connections regardless of client configuration

# SQL Server configuration to force encrypted connections
# Execute on the database server hosting CrossChex data
# Enable Force Encryption in SQL Server Configuration Manager
# or via registry:
# HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.x\MSSQLServer\SuperSocketNetLib
# Set ForceEncryption = 1
# Restart SQL Server service after configuration change