CVE-2021-3163

MEDIUM

Slab Quill 4.8.0 - Stored Cross-Site Scripting via IMG onloadstart Attribute

Title source: llm
STIX 2.1

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 (4)

Core 4
Core References
Product x_refsource_misc
https://quilljs.com
Broken Link, Issue Tracking, Third Party Advisory x_refsource_misc
https://github.com/quilljs/quill/issues/3273
Exploit, Issue Tracking, Third Party Advisory x_refsource_misc
https://github.com/quilljs/quill/issues/3364

Scores

CVSS v3 6.1
EPSS 0.0131
EPSS Percentile 67.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
npm/quill 0npm
slab/quill 4.8.0
Published Apr 12, 2021
Tracked Since Feb 18, 2026