CVE-2020-26870

medium

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.

References

https://www.oracle.com//security-alerts/cpujul2021.html

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870

https://lists.debian.org/debian-lts-announce/2020/10/msg00029.html

https://github.com/cure53/DOMPurify/compare/2.0.16...2.0.17

https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d

https://www.tenable.com/blog/microsoft-s-january-2021-patch-tuesday-addresses-83-cves

https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/

Details

Source: Mitre, NVD

Published: 2020-10-07

Updated: 2024-11-21

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N