What is CVE-2026-65903?

CVE-2026-65903 is a medium-severity vulnerability in Cure53 Dompurify, classified under Incorrect Comparison. CVSS score: 6.1/10. Published 2026-07-23.

How severe is CVE-2026-65903?

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

Vulnerability in Cure53 Dompurify

CVE-2026-65903

DOMPurify before 3.4.0 contains a logic error in the ADD_TAGS function where short-circuit evaluation allows forbidden tags to bypass FORBID_TAGS restrictions. Attackers can craft input containing tags listed in FORBID_TAGS that are also added via ADD_TAGS function, causing them to be retained in sanitized output.

EPSS: 0.003 (25.1th 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 0, 3.4.0

Weakness classification (CWE)

CWE-697 — Incorrect Comparison

References

disclosure@vulncheck.com (Exploit, vendor-advisory, Third Party Advisory)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-65903?: CVE-2026-65903 is a medium-severity vulnerability in Cure53 Dompurify, classified under Incorrect Comparison. CVSS score: 6.1/10. Published 2026-07-23.
How severe is CVE-2026-65903?: Medium severity. CVSS v3 base score is 6.1 out of 10.