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Vulnerability · Published Mar 3, 2026 · Assigned by VulnCheck

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

Medium 6.1

In plain English

A medium-severity cross-site scripting in DOMPurify from cure53. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.4%top 66.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12node-dompurifyno fix listedDEBIAN-CVE-2026-0540
Debian:13node-dompurifyno fix listedDEBIAN-CVE-2026-0540
Debian:14node-dompurify3.3.2+dfsg-1DEBIAN-CVE-2026-0540
Ubuntu:22.04:LTSnode-dompurifyno fix listedUBUNTU-CVE-2026-0540
Ubuntu:24.04:LTSnode-dompurifyno fix listedUBUNTU-CVE-2026-0540
Ubuntu:25.10node-dompurifyno fix listedUBUNTU-CVE-2026-0540
Ubuntu:26.04:LTSnode-dompurifyno fix listedUBUNTU-CVE-2026-0540
Ubuntu:26.10node-dompurifyno fix listedUBUNTU-CVE-2026-0540
npmdompurify2.5.9GHSA-v2wj-7wpq-c8vv
npmdompurify3.3.2GHSA-v2wj-7wpq-c8vv

Affected products (as reported)

VendorProductVersions
cure53 DOMPurify 3.1.3 – through 3.3.12.5.3 – through 2.5.8

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References