CVE-2026-0540: DOMPurify XSS via Missing Rawtext Elements in SAFE_FOR_XML

Published Mar 3, 2026
·
Updated

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.

Affected Software

3 affected components
npm/dompurify>=3.1.3<=3.3.1, >=2.5.3<=2.5.8
Cure53 DOMPurify>=2.5.3<=2.5.8
Cure53 DOMPurify>=3.1.3<=3.3.1

Remediation

Patch Available

https://github.com/cure53/DOMPurify/commit/fca0a938b4261ddc9c0293a289935a9029c049f5

Event History

Mar 3, 2026
CVE Published
via MITRE·05:26 PM
Data Sourced
via MITRE·05:26 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software
May 14, 58200
Event
via NVD·09:33 AM
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Frequently Asked Questions

1

What is the severity of CVE-2026-0540?

CVE-2026-0540 is classified as a high severity vulnerability due to its potential to allow cross-site scripting attacks.

2

How do I fix CVE-2026-0540?

To fix CVE-2026-0540, upgrade DOMPurify to version 3.3.1 or higher, or 2.5.8 or higher.

3

Which versions of DOMPurify are affected by CVE-2026-0540?

CVE-2026-0540 affects DOMPurify versions 3.1.3 through 3.3.1 and 2.5.3 through 2.5.8.

4

What type of vulnerability is CVE-2026-0540?

CVE-2026-0540 is a cross-site scripting (XSS) vulnerability.

5

Who is the vendor of the affected software in CVE-2026-0540?

The vendor of the affected software in CVE-2026-0540 is Cure53, which develops DOMPurify.

Company

Resources

Contact

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