Description
A vulnerability in the HTML editor of Slab Quill 4.8.0 allows an attacker to execute arbitrary JavaScript by storing an XSS payload (a crafted onloadstart attribute of an IMG element) in a text field. Note: Researchers have claimed that this issue is not within the product itself, but is intended behavior in a web browser
Remediation
References
https://burninatorsec.blogspot.com/2021/04/cve-2021-3163-xss-slab-quill-js.html
https://github.com/quilljs/quill/issues/3273
https://github.com/quilljs/quill/issues/3364
https://quilljs.com
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