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GHSA-chqj-j4fh-rw7m

Cross-Site Scripting in dompurify

Source: GitHub Advisory Database (reviewed) Moderate CVE-2019-16728

Packages

EcosystemPackageAffectedFixed in
npm dompurify < 2.0.3 2.0.3

Details

As written in the advisory (Markdown source, shown as plain text).

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: ```DOMPurify.sanitize(input, { FORBID_TAGS: ['svg', 'math'] });```

References

External links from the advisory. They lead to third-party sites.