CVE-2020-26870
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,
02 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,
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 4.88% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 91.7% of scored records. A rank, not a probability.
- NVD base score
- 6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-10-07 15:50Z6 YR AGO
- Last updated
- 2024-08-04 16:03Z2 YR AGO
- Reserved
- 2020-10-07
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
- Data version
- 5.1
- Document digest
- e29907ec18ac9f10f21c0205a8a1e8522dfee6f0eebb8e5051418ff119438ef3
05 Affected products
06 References
- research.securitum.comhttps://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/
- github.comhttps://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d
- github.comhttps://github.com/cure53/DOMPurify/compare/2.0.16...2.0.17
- lists.debian.org[debian-lts-announce] 20201029 [SECURITY] [DLA 2419-1] dompurify.js security updatehttps://lists.debian.org/debian-lts-announce/2020/10/msg00029.html
- portal.msrc.microsoft.comVisual Studio Remote Code Execution Vulnerabilityhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-26870
- www.oracle.comhttps://www.oracle.com//security-alerts/cpujul2021.html
07 Fixed in
Ubuntu 16.04 LTS
- dompurify.js No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- dompurify.js No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.