XSS in Slab Quill

CVE-2025-15056

A lack of data validation vulnerability in the HTML export feature in Quill in allows Cross-Site Scripting (XSS). This issue affects Quill: 2.0.3.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (12.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Slab Quill — versions 2.0.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

help@fluidattacks.com (Exploit, Third Party Advisory, third-party-advisory)
help@fluidattacks.com (Product, product)

Frequently asked questions

What is CVE-2025-15056?: CVE-2025-15056 is a medium-severity vulnerability in Slab Quill, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-13.
How severe is CVE-2025-15056?: Medium severity. CVSS v3 base score is 6.1 out of 10.