CVE-2025-62328: HCL Nomad Server Information Disclosure

CVE-2025-62328 Overview

HCL Nomad server on Domino did not configure the frame-ancestors directive in the Content-Security-Policy header by default which could allow an attacker to obtain sensitive information via unspecified vectors. This vulnerability represents an Improper Restriction of Rendered UI Layers or Frames (CWE-1021), which can enable clickjacking attacks where an attacker embeds the vulnerable application within a malicious iframe to trick users into performing unintended actions.

Critical Impact

Missing frame-ancestors CSP directive enables potential clickjacking attacks that could lead to sensitive information disclosure from HCL Nomad server deployments.

Affected Products

• HCL Nomad server on Domino

Discovery Timeline

• 2026-03-11 - CVE CVE-2025-62328 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2025-62328

Vulnerability Analysis

This vulnerability stems from an insecure default configuration in HCL Nomad server on Domino. The application fails to implement the frame-ancestors directive within its Content-Security-Policy (CSP) HTTP response header. Without this directive, the server does not instruct browsers to restrict which parent pages can embed the application in frames or iframes.

The frame-ancestors directive is a critical security control that supersedes the older X-Frame-Options header and provides more granular control over framing permissions. When absent, browsers allow the application to be embedded in frames on any domain, creating exposure to UI redressing attacks.

The network-based attack vector requires no privileges but has high attack complexity, as successful exploitation depends on social engineering to lure victims to attacker-controlled pages. The impact is limited to confidentiality with low severity, as attackers may be able to extract sensitive information through carefully crafted overlay attacks.

Root Cause

The root cause is an insecure default configuration where HCL Nomad server on Domino does not set the frame-ancestors directive in the Content-Security-Policy header. This missing security header allows the application to be framed by arbitrary domains, violating the principle of secure defaults.

Attack Vector

An attacker exploiting this vulnerability would create a malicious webpage that embeds the HCL Nomad server interface within an invisible iframe. By overlaying deceptive UI elements on top of the framed application, the attacker can trick authenticated users into clicking on hidden elements, potentially performing actions such as:

• Exposing sensitive data displayed in the Nomad interface
• Triggering unintended operations within the application
• Capturing user input intended for the legitimate application

The attack requires the victim to be authenticated to the Nomad server and to visit the attacker's malicious page. Social engineering techniques such as phishing emails containing links to the malicious page are typical delivery methods.

Detection Methods for CVE-2025-62328

Indicators of Compromise

• Unusual referrer headers in web server logs indicating external domains framing the Nomad server
• User reports of unexpected behavior when interacting with Nomad through unfamiliar links
• Detection of phishing campaigns targeting Nomad server users with links to suspicious domains

Detection Strategies

• Analyze HTTP response headers from HCL Nomad server to verify presence of frame-ancestors directive
• Implement web application firewall rules to log or alert on requests with suspicious referrer patterns
• Deploy browser security extensions or endpoint protection that detect clickjacking attempts
• Review web server access logs for patterns indicating iframe embedding from untrusted origins

Monitoring Recommendations

• Configure security monitoring to alert on missing CSP headers in responses from critical applications
• Establish baseline for normal referrer patterns and alert on anomalies
• Monitor for phishing attempts that reference HCL Nomad server URLs
• Implement regular security header audits as part of vulnerability management program

How to Mitigate CVE-2025-62328

Immediate Actions Required

• Review HCL's official security advisory for specific remediation guidance
• Configure the frame-ancestors directive in Content-Security-Policy headers immediately
• Audit current CSP configuration across all HCL Nomad server deployments
• Communicate with users about potential phishing risks until mitigation is complete

Patch Information

HCL has published guidance for addressing this vulnerability. Administrators should consult the HCL Software Knowledge Base Article for official remediation steps and any available patches or configuration updates.

Workarounds

• Manually configure the frame-ancestors directive to restrict framing to trusted origins only
• Implement X-Frame-Options header as a supplementary control for legacy browser compatibility
• Deploy web application firewall rules to inject security headers if server-side configuration is not immediately possible
• Restrict access to HCL Nomad server to trusted network segments while awaiting full remediation

# Example Content-Security-Policy header configuration
# Add to web server configuration to restrict framing to same origin only
Content-Security-Policy: frame-ancestors 'self';

# For Domino servers, consult HCL documentation for proper header configuration
# in notes.ini or through the server administration interface