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CVE-2021-3163

MEDIUM
6.1
CVSS Score
Published: April 12, 2021 at 08:35 PM UTC
Updated: June 17, 2026 at 04:04 AM UTC
1 product affected across 1 vendorQuill

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Severity
MEDIUM6.1
Exploit prediction
EPSS 1%
SSVC
No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://burninatorsec.blogspot.com/2021/04/cve-2021-3163-xss-slab-quill-js.html
x_refsource_MISCBroken LinkIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/quilljs/quill/issues/3273
x_refsource_MISCExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/quilljs/quill/issues/3364
x_refsource_MISCProduct
Source: [email protected]
https://quilljs.com

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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