PT-2021-19452 · Unknown · Slab Quill

Hieroshima · Published 2021-04-12 · Updated 2025-06-02 · CVE-2021-3163

Positive Technologies (AI Summary)

CVSS v2.0

4.3

Medium

Base vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Name of the Vulnerable Software and Affected Versions Slab Quill version 4.8.0

Description A vulnerability in the HTML editor of Slab Quill allows an attacker to execute arbitrary JavaScript by storing an XSS payload, specifically a crafted onloadstart attribute of an IMG element, in a text field. Researchers have claimed that this issue is not within the product itself, but is intended behavior in a web browser.

Recommendations For Slab Quill version 4.8.0, as a temporary workaround, consider disabling the use of the onloadstart attribute in the HTML editor until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-3163

GHSA-4943-9VGG-GR5R

Affected Products

Slab Quill

References · 13

• 🔥 https://github.com/quilljs/quill/issues/3364 · Exploit
• 🔥 https://burninatorsec.blogspot.com/2021/04/cve-2021-3163-xss-slab-quill-js.html · Exploit
• https://osv.dev/vulnerability/GHSA-4943-9vgg-gr5r · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3163 · Security Note
• https://osv.dev/vulnerability/CVE-2021-3163 · Vendor Advisory
• https://github.com/quilljs/quill/issues/3273 · Note
• https://github.com/quilljs/quill/issues/3359 · Note
• https://github.com/quilljs/quill · Note
• https://t.me/cvenotify/13132 · Telegram Post
• https://t.me/cvenotify/88815 · Telegram Post
• https://t.me/cvenotify/22339 · Telegram Post
• https://quilljs.com · Note
• https://twitter.com/OliverSorock/status/1929679310371057811 · Twitter Post