CVE-2026-27757: Sodola SL902 Auth Bypass Vulnerability

CVE-2026-27757 Overview

CVE-2026-27757 is an authentication vulnerability affecting SODOLA SL902-SWTGW124AS firmware versions through 200.1.20. The vulnerability allows authenticated users to change account passwords without verifying the current password. Attackers who gain access to an authenticated session can modify credentials to maintain persistent access to the management interface.

This weakness, classified as CWE-620 (Unverified Password Change), represents a significant security gap in the device's password management functionality. By bypassing the current password verification step, an attacker with any level of authenticated access can effectively hijack accounts, including administrative accounts, leading to complete device compromise.

Critical Impact

Attackers with authenticated session access can modify any account credentials without password verification, enabling persistent unauthorized access and potential full device takeover.

Affected Products

• SODOLA SL902-SWTGW124AS Firmware (versions through 200.1.20)
• SODOLA SL902-SWTGW124AS Hardware Device

Discovery Timeline

• 2026-02-27 - CVE-2026-27757 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2026-27757

Vulnerability Analysis

The SODOLA SL902-SWTGW124AS network switch contains a fundamental flaw in its password change mechanism. The web management interface fails to require verification of the current password when processing password change requests. This missing authentication step allows any user with an active session to modify credentials for any account accessible through the interface.

The vulnerability is particularly concerning for network infrastructure devices, as switches often serve as critical components in enterprise and home lab environments. The affected device is a 6-port 2.5G managed switch with 10G SFP capabilities, commonly deployed for network aggregation and VLAN management purposes.

From a network perspective, the attack requires low privileges but can be executed remotely without user interaction. The vulnerability primarily impacts integrity by allowing unauthorized credential modifications, with lower confidentiality impact through potential information disclosure.

Root Cause

The root cause of CVE-2026-27757 is the absence of current password verification in the password change functionality (CWE-620). The firmware does not implement proper authentication checks to confirm the user initiating the password change request actually knows the existing password. This design flaw violates fundamental security principles requiring re-authentication for sensitive operations.

Properly implemented password change mechanisms should:

1. Require the current password before accepting a new password
2. Validate the current password against stored credentials
3. Implement rate limiting to prevent brute-force attempts
4. Log all password change attempts for audit purposes

Attack Vector

The attack vector for CVE-2026-27757 is network-based, requiring the attacker to have access to an authenticated session on the device's web management interface. This could be achieved through several means:

1. Session Hijacking: Capturing an authenticated user's session token through network sniffing or cross-site scripting
2. Credential Theft: Using stolen or default credentials to establish an initial authenticated session
3. Physical Access: Accessing an unattended workstation with an active management session
4. Social Engineering: Tricking a legitimate user into providing session access

Once authenticated session access is obtained, the attacker can navigate to the password change functionality and modify any account password without providing the current credential. This enables persistence by changing administrative passwords and locking out legitimate administrators.

Detection Methods for CVE-2026-27757

Indicators of Compromise

• Unexpected password change events in device logs without corresponding valid authentication
• Multiple accounts experiencing password changes in a short timeframe
• Administrative lockouts or access denied errors for legitimate users
• Unfamiliar or unauthorized sessions appearing in the management interface

Detection Strategies

• Monitor authentication logs for password change activities that occur without preceding successful authentication challenges
• Implement network monitoring to detect unusual traffic patterns to the switch management interface
• Deploy session monitoring to identify potential session hijacking attempts
• Review access logs for abnormal administrative activity patterns

Monitoring Recommendations

• Enable comprehensive logging on the SODOLA switch management interface if available
• Configure SIEM rules to alert on password modification events from the device
• Implement network segmentation to restrict management interface access to authorized systems only
• Establish baseline behavior for administrative actions to identify anomalies

How to Mitigate CVE-2026-27757

Immediate Actions Required

• Restrict network access to the switch management interface using firewall rules or VLAN isolation
• Review all user accounts on affected devices and reset passwords from a secure, isolated session
• Implement strong network segmentation to limit exposure of management interfaces
• Monitor for any unauthorized access or configuration changes on affected devices

Patch Information

As of the last update on 2026-03-03, no vendor patch information is available in the CVE data. Organizations should monitor the VulnCheck Advisory on SL902 and the Sodola Network Product Overview page for firmware updates that address this vulnerability.

Contact Sodola Network directly for information about security patches or firmware updates that remediate CVE-2026-27757.

Workarounds

• Isolate the management interface on a dedicated management VLAN with strict access controls
• Implement IP-based access restrictions to limit management interface access to specific administrator workstations
• Disable remote management access if not required and manage the device via console connection only
• Deploy a jump server or bastion host for all management interface access to provide an additional authentication layer

# Example network isolation configuration (firewall rules)
# Restrict management interface access to specific admin subnet
# Apply these rules on your upstream firewall or router

# Allow management access only from admin workstations
iptables -A INPUT -p tcp --dport 80 -s 192.168.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP