CVE-2026-49459
Description
A flaw was found in DOMPurify, a library designed to sanitize HTML, MathML, and SVG to prevent cross-site scripting (XSS) attacks. A remote attacker could exploit a vulnerability in the DOMPurify.sanitize function when used with the IN_PLACE: true option. This flaw allows an attacker to bypass the sanitizer and inject malicious event-handler attributes into an attacker-controlled form element. Successful exploitation could lead to the execution of arbitrary scripts in the user's browser, potentially compromising user data or session integrity.
Statement
This Moderate-impact cross-site scripting (XSS) bypass in DOMPurify arises when the DOMPurify.sanitize function is invoked with the IN_PLACE: true option on an attacker-controlled HTML form element. Successful exploitation requires a specific application configuration where untrusted HTML is processed in this manner, allowing malicious event handlers to persist and execute arbitrary scripts. Red Hat products are generally not affected by default configurations, as this specific usage pattern is uncommon.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.7 | N/A | 6.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Changed | N/A | Changed |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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