CVE-2026-65902

A flaw was found in DOMPurify. An attacker can exploit a vulnerability in how DOMPurify handles its sanitization hooks when default configurations are used. By manipulating the uponSanitizeElement or uponSanitizeAttribute hooks, an attacker can permanently alter the allowed HTML tags and attributes. This allows malicious content to bypass sanitization, potentially leading to cross-site scripting (XSS) attacks and compromising the integrity of web applications.

This flaw in DOMPurify allows an attacker to bypass sanitization by manipulating internal hooks, leading to potential cross-site scripting (XSS) vulnerabilities. The issue permanently alters the default allow-lists for the DOMPurify instance when default configurations are used. Red Hat products, including Red Hat Hardened Images, are not affected by this vulnerability.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.