CVE-2020-26870
MEDIUM
6.1
CVSS Score
Published: October 7, 2020 at 03:50 PM UTC
Updated: June 17, 2026 at 03:08 AM UTC
5 products affected across 4 vendorsDebian LinuxVisual Studio 2019Visual Studio 2017
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Severity
MEDIUM6.1
Exploit prediction
EPSS 5%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 2.0.17
Affected range stops below 2.0.17, so it looks safe — our inference, not a vendor statement
Debian Linux· Debiandrupal
95%95%
v < 21.1.0.00.01
Affected range stops below 21.1.0.00.01, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (6)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62dx_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/cure53/DOMPurify/compare/2.0.16...2.0.17Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/10/msg00029.htmlVendor Advisoryx_refsource_MSPatch
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://www.oracle.com//security-alerts/cpujul2021.htmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-79
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