CVE-2020-26870
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.
- Exploit odds
- 4.9% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 4.9% in the next 30 days (EPSS).
- Severity: 6.1 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 4.9% · EPSS, next 30 days
- Weakness
- CWE-79 · Cross-site scripting
- Record status
- Modified
Affected
- cure53 Dompurify < 2.0.17
- 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
Attack profile CVSS 3.1 · 6.1
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2020-26870.md and follow it. Check whether this project is affected by CVE-2020-26870. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d
- https://github.com/cure53/DOMPurify/compare/2.0.16...2.0.17
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d
- https://github.com/cure53/DOMPurify/compare/2.0.16...2.0.17
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870
- https://www.oracle.com//security-alerts/cpujul2021.html
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/
- https://www.oracle.com//security-alerts/cpujul2021.html
- 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