Medium severity6.1NVD Advisory· Published Apr 12, 2021· Updated Jun 17, 2026
CVE-2021-3163
CVE-2021-3163
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
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
quillnpm | <= 1.3.7 | — |
Affected products
3- Slab Quill/Slab Quilldescription
Patches
Vulnerability mechanics
References
7- burninatorsec.blogspot.com/2021/04/cve-2021-3163-xss-slab-quill-js.htmlnvdExploitThird Party AdvisoryWEB
- github.com/quilljs/quill/issues/3364nvdExploitIssue TrackingThird Party AdvisoryWEB
- github.com/advisories/GHSA-4943-9vgg-gr5rghsaADVISORY
- github.com/quilljs/quill/issues/3273nvdBroken LinkIssue TrackingThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2021-3163ghsaADVISORY
- github.com/quilljs/quill/issues/3359ghsaWEB
- quilljs.comnvdProductWEB
News mentions
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