CVE-2026-35148 Overview
CVE-2026-35148 is a Missing Access Control vulnerability [CWE-284] affecting HCL DFXServer. Certain endpoints in the application are accessible without any form of authentication when accessed through another browser. Any network-adjacent user can invoke these APIs and interact with the application without identity or authorization verification.
The flaw allows attackers to bypass authentication controls and execute privileged operations against exposed endpoints. Exploitation requires user interaction, limiting fully automated attacks but permitting social engineering vectors. HCL Software has published a knowledge base article documenting the issue and remediation steps.
Critical Impact
Unauthenticated attackers can invoke sensitive HCL DFXServer API endpoints across the network, resulting in unauthorized access to application functionality and data with limited impact to confidentiality, integrity, and availability.
Affected Products
- HCL DFXServer (specific versions listed in vendor advisory)
Discovery Timeline
- 2026-07-16 - CVE-2026-35148 published to NVD
- 2026-07-16 - Last updated in NVD database
Technical Details for CVE-2026-35148
Vulnerability Analysis
CVE-2026-35148 stems from improper access control enforcement in HCL DFXServer. The application exposes API endpoints that fail to validate authentication tokens or session state when requests originate from a separate browser context. This condition permits any user with network access to interact with protected functionality.
The vulnerability maps to [CWE-284] Improper Access Control. The root problem is missing authorization checks at the endpoint handler level. Attackers do not need credentials, elevated privileges, or prior access to the target system.
Exploitation requires user interaction, likely involving a victim opening a crafted link or triggering a request from a second browser session. The scope is unchanged, meaning the impact is confined to the vulnerable component. Confidentiality, integrity, and availability impacts are all rated low, indicating partial exposure rather than full system compromise.
Root Cause
The root cause is the absence of authentication middleware or authorization filters on specific HCL DFXServer endpoints. Request handlers process incoming API calls without verifying session tokens, API keys, or user identity. This design flaw allows any HTTP client to invoke restricted operations directly.
Attack Vector
The attack vector is network-based with low complexity. An attacker sends crafted HTTP requests to the exposed endpoints from any host that can reach the DFXServer instance. The user interaction requirement suggests the exploit path involves inducing a legitimate user to load attacker-controlled content in a separate browser, which then issues the unauthenticated API calls.
No public proof-of-concept code or exploit modules have been published. Refer to the HCL Software Support Article for vendor-provided technical details.
Detection Methods for CVE-2026-35148
Indicators of Compromise
- Unauthenticated HTTP requests to HCL DFXServer API endpoints originating from external or unexpected internal hosts
- API access log entries lacking associated session identifiers or authentication headers
- Anomalous invocation patterns against endpoints that should require login
Detection Strategies
- Review web server and application logs for API calls that succeed without an authentication token or session cookie
- Correlate DFXServer access logs against authentication server logs to identify requests with no matching login event
- Deploy signatures on web application firewalls to flag direct API access from untrusted network segments
Monitoring Recommendations
- Enable verbose request logging on DFXServer to capture headers, source IPs, and endpoint paths
- Forward application logs to a centralized SIEM for correlation and long-term retention
- Alert on repeated access to sensitive endpoints from a single source without authenticated sessions
How to Mitigate CVE-2026-35148
Immediate Actions Required
- Apply the fix documented in the HCL Software Support Article KB0131782
- Restrict network access to DFXServer administrative and API endpoints using firewall rules or reverse proxy access controls
- Audit existing access logs for evidence of unauthenticated endpoint invocation prior to patching
Patch Information
HCL Software has released remediation guidance in knowledge base article KB0131782. Administrators should consult the vendor advisory for the specific fixed version and upgrade procedure applicable to their deployment. Patch immediately in production environments exposed to untrusted networks.
Workarounds
- Place DFXServer behind an authenticating reverse proxy that enforces identity verification on all API paths
- Segment DFXServer into a restricted network zone accessible only to authenticated internal users
- Disable or block the affected endpoints at the network layer until patching is complete
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
