Cross-site Scripting in quill
A vulnerability in the HTML editor of Slab Quill allows an attacker to execute arbitrary JavaScript by storing an XSS payload (a crafted onloadstart attribute of an IMG element) in a text field. No patch exists and no further releases are planned.
This CVE is disputed. Researchers have claimed that this issue is not within the product itself, but is intended behavior in a web browser. More information can be found here.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | quill | <= 1.3.7 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-3163
- https://github.com/quilljs/quill/issues/3273
- https://github.com/quilljs/quill/issues/3359
- https://github.com/quilljs/quill/issues/3364
- https://burninatorsec.blogspot.com/2021/04/cve-2021-3163-xss-slab-quill-js.html
- https://github.com/quilljs/quill
- https://quilljs.com
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
quill- Disclosed
- 10.05.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-4943-9vgg-gr5r - CC BY 4.0
Vulnerability history: quill
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 09.2020 01.2026
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
- Low 1
Disclosures per year
- 2020: 1
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
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