CVSS 3.1
6.1 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NCVE-2020-26870
Medium (6.1). EPSS 4.9% chance of exploitation in the next 30 days. Fixed in dompurify 2.0.17.
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.
Severity
- EPSS
- 4.9% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- cure53:dompurify
- debian:debian_linux
- microsoft:visual_studio_2017
- microsoft:visual_studio_2019
- oracle:application_express
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-63q7-h895-m982 | npm | dompurify | <2.0.17 | 2.0.17 |
References
- 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/