PT-2026-34604 · Dompurify · Dompurify

Kodareef5 · Published 2026-04-22 · Updated 2026-05-29 · CVE-2026-41240

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions DOMPurify versions prior to 3.4.0

Description An inconsistency exists between the handling of FORBID TAGS and FORBID ATTR when a function-based ADD TAGS configuration is used. Specifically, when the EXTRA ELEMENT HANDLING.tagCheck function returns true, a short-circuit evaluation occurs that bypasses the FORBID TAGS check. This allows forbidden elements, such as iframe, object, embed, and form, to bypass sanitization and remain in the output with their attributes intact.

Recommendations Update to version 3.4.0.

Exploit

Fix

XSS

Weakness Enumeration

CWE-183

CWE-79

Related Identifiers

CLEANSTART-2026-BE61221

CLEANSTART-2026-LC05413

CVE-2026-41240

GHSA-H7MW-GPVR-XQ4M

OPENSUSE-SU-2026:10888-1

Affected Products

Dompurify

References · 214

• 🔥 https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m · Exploit
• https://github.com/cure53/DOMPurify/commit/c361baa18dbdcb3344a41110f4c48ad85bf48f80 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-29087 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42036 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-44457 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-41240 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33750 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33894 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42035 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42041 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-4923 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33916 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42264 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-0540 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10888-1 · Vendor Advisory