CVE-2026-0540

Description

DOMPurify 3.1.3 through 3.3.1 and 2.5.3 through 2.5.8, fixed in commit 2726c74, contain a cross-site scripting vulnerability that allows attackers to bypass attribute sanitization by exploiting five missing rawtext elements (noscript, xmp, noembed, noframes, iframe) in the SAFE_FOR_XML regex. Attackers can include payloads like </noscript><img src=x onerror=alert(1)> in attribute values to execute JavaScript when sanitized output is placed inside these unprotected rawtext contexts.

How to fix CVE-2026-0540

To remediate CVE-2026-0540, upgrade the affected package to a fixed version below.

• —no fix listed
• —upgrade to 3.3.2 or later

Is CVE-2026-0540 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0
• >= 3.1.3, < 3.3.2

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-0540
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-0540
• PATCHgithub.com/cure53/DOMPurify
• WEBfluidattacks.com/advisories/daft
• WEB