MediumGHSA-chqj-j4fh-rw7mCVE-2019-16728

Cross-Site Scripting in dompurify

Published 28 Aug 2020 · Updated 8 Nov 2023

Affected package

dompurifynpm
Affected
<2.0.3
Fixed in
2.0.3
Update to the fixed version for your release line, for example:npm install dompurify@2.0.3

Details

Versions of dompurify prior to 2.0.3 are vulnerable to Cross-Site Scripting (XSS). The package has an XSS filter bypass due to Mutation XSS in both Chrome and Safari through a combination of <svg>/<math> elements and </p>/</br>. An example payload is: <svg></p><style><a id="</style><img src=1 onerror=alert(1)>">. This allows attackers to bypass the XSS protection and execute arbitrary JavaScript in a victim's browser.

Recommendation

Upgrade to version 2.0.3 or later. You may also disallow <svg> and <math> through dompurify configurations:

FORBID_TAGS: ['svg', 'math'] });```

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.