CVE-2021-3163

medium

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

References

https://quilljs.com

https://github.com/quilljs/quill/issues/3364

https://github.com/quilljs/quill/issues/3273

https://burninatorsec.blogspot.com/2021/04/cve-2021-3163-xss-slab-quill-js.html

Details

Source: Mitre, NVD

Published: 2021-04-12

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Severity: Medium

EPSS

EPSS: 0.00217