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Vulnerability record · CVE-2026-0540 · published 3 March 2026

CVE-2026-0540: Cure53 dompurify cross-site scripting vulnerability

Cure53 · Dompurify

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.

5.3 CVSS 4.0 Medium EPSS 0.34% · top 75.1% CWE-79 · Cross-site scripting
5.3CVSS 4.0 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://fluidattacks.com/advisories/daft
https://github.com/cure53/DOMPurify Product
https://github.com/cure53/DOMPurify/commit/302b51de22535cc90235472c52e3401bedd46f80
https://github.com/cure53/DOMPurify/releases/tag/3.3.2
https://www.vulncheck.com/advisories/dompurify-xss-via-missing-rawtext-elements-in-safe-for-xml Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-48910Cure53 dompurify prototype pollution vulnerabilityDOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify was vulnerable to prototype pollution. This vuln…EPSS 1.2%8.2CVE-2026-47423Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. In 3.4.4, DOMPurify allowed selectedcontent by default, allowing br…EPSS 0.41%6.3CVE-2026-49978Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow c…EPSS 0.40%6.1CVE-2026-49458Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accept…EPSS 0.40%6.1CVE-2026-49459Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(root, { IN_PLACE: true }) could …EPSS 0.37%6.1CVE-2025-26791Cure53 dompurify cross-site scripting vulnerabilityDOMPurify before 3.2.4 has an incorrect template literal regular expression, sometimes leading to mutation cross-site scripting (mXSS).EPSS 0.61%6.1CVE-2024-47875Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to nesting-based mXSS. This vulne…EPSS 1.1%6.1CVE-2024-45801Cure53 dompurify inefficient regular expression (redos) vulnerabilityDOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. It has been discovered that malicious HTML using special n…EPSS 0.89%

Source: NIST National Vulnerability Database (record CVE-2026-0540), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.