Cross-site scripting in DOMPurify - CVE-2026-49459
Published: May 27, 2026
Vulnerability identifier: #VU132356
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-49459
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary script code in the victim's browser.
The vulnerability exists due to improper neutralization of script-related html attributes in the in_place mode root element handling when sanitizing attacker-controlled root dom content. A remote attacker can supply a crafted root element whose clobbered attributes are preserved to execute arbitrary script code in the victim's browser.
User interaction is required to load or process the crafted content.
Affected software
DOMPurify
How to mitigate CVE-2026-49459
Install security update from vendor's website.
DOMPurify - update to 3.4.6