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Description

DOMPurify 3.1.3 through 3.3.1 and 2.5.3 through 2.5.8, fixed in commit 729097f, 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.

PUBLISHED Reserved 2025-12-27 | Published 2026-03-03 | Updated 2026-03-05 | Assigner VulnCheck




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
MEDIUM: 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

3.1.3 (semver)
affected

2.5.3 (semver)
affected

Credits

Scott Moore - VulnCheck finder

References

github.com/cure53/DOMPurify (DOMPurify GitHub Repository) product

github.com/...ommit/fca0a938b4261ddc9c0293a289935a9029c049f5 patch

www.vulncheck.com/...issing-rawtext-elements-in-safe-for-xml (VulnCheck Advisory: DOMPurify XSS via Missing Rawtext Elements in SAFE_FOR_XML) third-party-advisory

cve.org (CVE-2026-0540)

nvd.nist.gov (CVE-2026-0540)

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