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TI-2021-02246 Aliases CVE-2021-3163GHSA-4943-9vgg-gr5r

A vulnerability in the HTML editor of Slab Quill 4.8.0 allows an attacker to execute…

Priority LOW 30CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01311 70th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—quill (npm)up to 1.3.7—No fix listedGHSA-4943-9vgg-gr5r
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • quill (npm) Vendor— Affected up to 1.3.7 Fixed in — No fix listed GHSA-4943-9vgg-gr5r

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:slab:quill:4.8.0:*:*:*:*:node.js:*:*4.8.0VulnerableSlab
  • cpe:2.3:a:slab:quill:4.8.0:*:*:*:*:node.js:*:* Versions 4.8.0 Vulnerable ·Slab

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3163
  2. 2026-10-03 Alias added: GHSA-4943-9vgg-gr5r

References

Exploit 2

Advisory 2

Other 3

  • TI-2025-13736 Quill 2.0.3 - Lack of data validation in HTML export allowing XSS CVSS 4.0MEDIUM 5.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences