CVE-2020-26870 Information

Description

Cure53 DOMPurify before 2.0.17 allows mutation XSS. This occurs because a serialize-parse roundtrip does not necessarily return the original DOM tree and a namespace can change from HTML to MathML as demonstrated by nesting of FORM elements.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Reference

https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d https://github.com/cure53/DOMPurify/compare/2.0.16…2.0.17 https://lists.debian.org/debian-lts-announce/2020/10/msg00029.html https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1