CVE-2025-31969: HCL Unica Platform XSS Vulnerability

CVE-2025-31969 Overview

CVE-2025-31969 affects HCL Unica Platform through a misconfigured Content Security Policy (CSP). The weakness allows browsers to load resources that a properly restrictive CSP would block. Attackers can leverage this gap to deliver cross-site scripting (XSS) payloads and clickjacking attacks against authenticated users.

The issue is classified under [CWE-358] (Improperly Implemented Security Check for Standard). Exploitation requires user interaction, typically by luring a victim to a crafted page or link, and results in limited confidentiality and integrity impact with scope change to the browser context.

Critical Impact
A misconfigured CSP in HCL Unica Platform enables loading of untrusted resources, exposing users to XSS and clickjacking attacks that can hijack sessions or manipulate UI actions.

Affected Products

HCL Unica Platform (vendor: hcltech)
Product identifier: cpe:2.3:a:hcltech:unica
Component: hcltech:unica

Discovery Timeline

2025-10-12 - CVE-2025-31969 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31969

Vulnerability Analysis

HCL Unica Platform ships with a Content Security Policy that fails to enforce restrictions expected of a hardened web application. CSP is an HTTP response header that instructs the browser which sources of scripts, styles, frames, and other resources are permitted. When directives such as script-src, frame-ancestors, or object-src are missing, overly permissive, or include unsafe values like unsafe-inline and wildcards, the browser cannot block injected or embedded malicious content.

Because Unica handles marketing data, customer segments, and campaign workflows, a successful XSS or clickjacking attack can lead to session token theft, unauthorized campaign modification, or the execution of privileged actions on behalf of an authenticated user. The CVSS vector indicates network-based exploitation requiring user interaction, with scope change reflecting impact that crosses from the vulnerable application into the browser trust boundary.

Root Cause

The root cause is an improperly implemented security control [CWE-358]. The CSP header returned by Unica does not adequately constrain content sources, permitting inline scripts, external resource loading, or framing by arbitrary origins. This defeats the browser-side defense that CSP is designed to provide against injection and UI redress attacks.

Attack Vector

An attacker crafts a malicious page or injects content that a victim's browser renders in the context of the Unica application. Without a restrictive frame-ancestors directive, the attacker can embed Unica pages in a hostile iframe and perform clickjacking. Without strict script-src controls, injected scripts can execute and access session data or perform actions as the authenticated user.

See the HCL Software Security Advisory for vendor-specific technical details and affected version ranges.

Detection Methods for CVE-2025-31969

Indicators of Compromise

Unexpected outbound requests from user browsers to attacker-controlled domains after loading Unica pages.
HTTP responses from Unica endpoints missing a Content-Security-Policy header or containing permissive directives such as default-src * or unsafe-inline.
Unica user sessions performing actions from unusual referrer origins consistent with clickjacking frames.

Detection Strategies

Inspect Unica HTTP response headers with tools such as curl -I or browser developer tools and flag missing or weak CSP directives.
Enable CSP report-only mode with report-uri to collect violation reports and identify unexpected script or frame sources.
Correlate web proxy and browser telemetry to identify script execution from origins not associated with Unica.

Monitoring Recommendations

Continuously monitor CSP violation reports for anomalies in script, style, and frame source loading.
Alert on Unica sessions where authentication or campaign-modifying actions originate from framed contexts or unexpected referrers.
Review web application firewall logs for XSS payload patterns targeting Unica request parameters.

How to Mitigate CVE-2025-31969

Immediate Actions Required

Apply the vendor fix described in the HCL Software Security Advisory KB0124417.
Restrict Unica administrative access to trusted networks until patching is complete.
Educate users to avoid clicking untrusted links that reference Unica URLs or embed Unica functionality.

Patch Information

HCL has published guidance and remediation for CVE-2025-31969 in the vendor advisory. Administrators should consult the HCL Software Security Advisory for the fixed version and upgrade instructions applicable to their deployment.

Workarounds

Deploy a reverse proxy or web application firewall that injects a hardened Content-Security-Policy header with strict script-src, frame-ancestors 'none', and object-src 'none' directives.
Set X-Frame-Options: DENY on Unica responses to mitigate clickjacking where CSP frame-ancestors is not honored.
Enforce HttpOnly and Secure flags on Unica session cookies to reduce impact of any injected script.

bash

# Example hardened CSP header enforced at a reverse proxy
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'none'; base-uri 'self'" always;
add_header X-Frame-Options "DENY" always;
add_header X-Content-Type-Options "nosniff" always;