Vulnerability Details : CVE-2020-26870
Potential exploit
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.
Vulnerability category: Cross site scripting (XSS)
Products affected by CVE-2020-26870
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2017:15.9:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2019:16.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2019:16.8:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2019:16.4:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2019:16.7:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:application_express:*:*:*:*:*:*:*:*
- cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-26870
0.35%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 72 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-26870
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
6.1
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
2.8
|
2.7
|
NIST |
CWE ids for CVE-2020-26870
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-26870
-
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870
CVE-2020-26870 - Security Update Guide - Microsoft - Visual Studio Remote Code Execution VulnerabilityPatch;Vendor Advisory
-
https://lists.debian.org/debian-lts-announce/2020/10/msg00029.html
[SECURITY] [DLA 2419-1] dompurify.js security updateMailing List;Third Party Advisory
-
https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d
fix: attemtping to fix another mutation behavior · cure53/DOMPurify@02724b8 · GitHubPatch;Third Party Advisory
-
https://www.oracle.com//security-alerts/cpujul2021.html
Oracle Critical Patch Update Advisory - July 2021Patch;Third Party Advisory
-
https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/
Mutation XSS via namespace confusion - DOMPurify < 2.0.17 bypass - research.securitum.comExploit;Third Party Advisory
-
https://github.com/cure53/DOMPurify/compare/2.0.16...2.0.17
Comparing 2.0.16...2.0.17 · cure53/DOMPurify · GitHubPatch;Third Party Advisory
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