CVE-2026-2401: Information Disclosure Vulnerability

CVE-2026-2401 Overview

A CWE-532 Insertion of Sensitive Information into Log File vulnerability has been identified that could cause confidential information to be exposed when a Web Admin user executes a malicious file provided by an attacker. This information disclosure vulnerability requires local access and user interaction, allowing attackers to potentially harvest sensitive data written to application log files.

Critical Impact

Confidential information exposure through log files when administrators execute attacker-provided malicious files

Affected Products

• Schneider Electric products (refer to Schneider Electric Security Notice for complete list)

Discovery Timeline

• 2026-04-14 - CVE-2026-2401 published to NVD
• 2026-04-14 - Last updated in NVD database

Technical Details for CVE-2026-2401

Vulnerability Analysis

This vulnerability falls under CWE-532 (Insertion of Sensitive Information into Log File), a class of information disclosure issues where applications inadvertently write sensitive data to log files. In this case, the vulnerability is triggered when a Web Admin user executes a malicious file that has been crafted by an attacker.

The attack requires local access to the system and depends on user interaction—specifically, an administrator must be socially engineered into executing the malicious file. Once executed, confidential information gets written to log files where it can be accessed by unauthorized parties with sufficient privileges to read those logs.

Root Cause

The underlying issue stems from improper handling of sensitive information during logging operations. When the malicious file is executed by a privileged Web Admin user, the application fails to sanitize or filter sensitive data before writing it to log files. This can include credentials, session tokens, API keys, or other confidential configuration data that should never be persisted in plaintext log storage.

Attack Vector

The attack vector is local, requiring the attacker to either have existing access to the target system or to deliver a malicious file through social engineering techniques. The exploitation flow involves:

1. Attacker crafts a malicious file designed to trigger sensitive information logging
2. Attacker delivers the file to a Web Admin user through phishing, email, or other social engineering methods
3. Web Admin user executes the malicious file within the application context
4. Sensitive information is written to application log files
5. Attacker retrieves or accesses the log files to harvest the exposed confidential data

The vulnerability mechanism involves improper data handling during file execution within the administrative interface. When the malicious file is processed, it triggers logging routines that capture sensitive information without proper redaction. Refer to the Schneider Electric Security Notice for complete technical details.

Detection Methods for CVE-2026-2401

Indicators of Compromise

• Unusual log file access patterns, particularly from non-administrative accounts
• Presence of unexpected or unauthorized files in Web Admin accessible directories
• Log files containing sensitive data such as credentials, tokens, or encryption keys
• Evidence of file execution events initiated by Web Admin users from untrusted sources

Detection Strategies

• Implement file integrity monitoring on log directories to detect unauthorized access or modifications
• Deploy endpoint detection and response (EDR) solutions to monitor file execution events by privileged users
• Configure SIEM rules to alert on sensitive data patterns appearing in log files
• Monitor for suspicious file downloads or transfers to administrative workstations

Monitoring Recommendations

• Enable verbose auditing of administrative user actions, particularly file execution events
• Implement log monitoring solutions that can detect sensitive data patterns in real-time
• Review log file permissions regularly to ensure principle of least privilege
• Deploy data loss prevention (DLP) tools to identify sensitive information in log storage

How to Mitigate CVE-2026-2401

Immediate Actions Required

• Review and apply security patches from Schneider Electric as they become available
• Restrict log file access to only essential personnel and automated systems
• Implement strict file execution policies for Web Admin users
• Train administrative users to recognize and avoid executing untrusted files

Patch Information

Schneider Electric has issued a security notice addressing this vulnerability. Organizations should consult the Schneider Electric Security Notice SEVD-2026-104-01 for official patch information and remediation guidance specific to affected products.

Workarounds

• Implement application whitelisting to prevent execution of unauthorized files by Web Admin users
• Configure log rotation with short retention periods to minimize exposure window
• Apply strict access controls on log file directories using filesystem permissions
• Consider implementing log file encryption to protect sensitive data at rest

# Configuration example
# Restrict log file access to administrative accounts only
chmod 640 /var/log/application/*.log
chown root:admin /var/log/application/*.log

# Configure log rotation with shorter retention
# Edit /etc/logrotate.d/application
# daily
# rotate 7
# compress
# delaycompress