What is CVE-2026-0540?

CVE-2026-0540 is a medium-severity vulnerability in Cure53 Dompurify, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-03.

How severe is CVE-2026-0540?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Cure53 Dompurify

CVE-2026-0540

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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (26.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Cure53 Dompurify — versions 3.1.3, 2.5.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

help@fluidattacks.com (Product, product)
help@fluidattacks.com (patch)
help@fluidattacks.com (release-notes)
help@fluidattacks.com (third-party-advisory)
help@fluidattacks.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-0540?: CVE-2026-0540 is a medium-severity vulnerability in Cure53 Dompurify, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-03.
How severe is CVE-2026-0540?: Medium severity. CVSS v3 base score is 6.1 out of 10.