CVE-2020-26870: XSS
First published: Wed Oct 07 2020(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cure53 DOMPurify | <2.0.17 | |
| Debian Debian Linux | =9.0 | |
| Microsoft Visual Studio 2017 | =15.9 | |
| Microsoft Visual Studio 2019 | =16.0 | |
| Microsoft Visual Studio 2019 | =16.4 | |
| Microsoft Visual Studio 2019 | =16.7 | |
| Microsoft Visual Studio 2019 | =16.8 | |
| Oracle Application Express | <21.1.0.00.01 |
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Reference Links
- 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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870
- https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/
- https://www.oracle.com//security-alerts/cpujul2021.html
Frequently Asked Questions
What is CVE-2020-26870?
CVE-2020-26870 is a vulnerability in Cure53 DOMPurify before 2.0.17 that allows mutation XSS.
How does CVE-2020-26870 occur?
CVE-2020-26870 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.
What is the severity of CVE-2020-26870?
CVE-2020-26870 has a severity level keyword of 'medium' with a severity value of 6.1.
Which software versions are affected by CVE-2020-26870?
Cure53 DOMPurify before version 2.0.17, Debian Debian Linux 9.0, Microsoft Visual Studio 2017 version 15.9, Microsoft Visual Studio 2019 versions 16.0, 16.4, 16.7, and 16.8, and Oracle Application Express up to version 21.1.0.00.01 are affected by CVE-2020-26870.
How can I fix CVE-2020-26870?
To fix CVE-2020-26870, update Cure53 DOMPurify to version 2.0.17 and follow any additional recommendations from the software vendor.
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