CVE-2026-35149 in DFXServer
Summary
by MITRE • 07/16/2026
HCL DFXServer is affected by an Authentication Bypass vulnerability via server response manipulation. An unauthorized user without valid credentials can exploit this flaw by intercepting and altering the server's authentication responses, allowing them to gain unauthorized access to the application without verification.
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Analysis
by VulDB Data Team • 07/16/2026
This vulnerability represents a critical authentication bypass flaw in HCL DFXServer that fundamentally undermines the security posture of the application. The issue stems from insufficient validation of server responses during the authentication process, creating an avenue for malicious actors to manipulate communication flows and circumvent proper credential verification. The vulnerability operates at the protocol level where the system fails to adequately verify the authenticity and integrity of response messages, allowing attackers to craft falsified responses that the server accepts as legitimate authentication confirmations.
The technical implementation of this flaw exposes a fundamental weakness in the server's response validation mechanisms. When legitimate authentication requests are processed, the system generates response messages that contain authentication tokens or status indicators which should be cryptographically verified before being accepted. However, due to inadequate input sanitization and response validation, attackers can intercept these responses and modify them to include false authentication confirmations or bypass the need for proper credential verification entirely. This type of vulnerability is classified under CWE-287, which specifically addresses improper authentication issues in software systems.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data breaches, privilege escalation, and system compromise. An attacker exploiting this flaw can gain access to sensitive application functionality without requiring legitimate credentials, potentially allowing them to manipulate application data, execute administrative commands, or access restricted resources. The vulnerability's exploitation requires minimal skill level and can be automated, making it particularly dangerous in environments where the server handles critical business processes or sensitive information.
From a cybersecurity framework perspective, this vulnerability directly maps to several ATT&CK techniques including T1078 for valid accounts usage and T1566 for credential harvesting. The attack chain typically involves network interception capabilities, response manipulation tools, and knowledge of the application's authentication protocol structure. Organizations using HCL DFXServer should implement immediate mitigations including enhanced response validation mechanisms, cryptographic verification of authentication responses, and network monitoring to detect unusual authentication patterns. Additionally, implementing proper session management controls and ensuring that all authentication responses are cryptographically signed can prevent exploitation of this class of vulnerability.
The root cause analysis reveals that the server's authentication flow lacks proper integrity checks and fails to implement robust response validation protocols. This creates a dangerous trust model where the system assumes response authenticity without sufficient verification mechanisms. Organizations should consider implementing multi-factor authentication controls, enhanced logging and monitoring for authentication events, and regular security assessments to identify similar vulnerabilities in other components of their infrastructure. The vulnerability also highlights the importance of following secure coding practices that emphasize input validation and response integrity checking as fundamental security controls within application development lifecycle processes.