How severe is CVE-2025-15056?

No CVSS score has been assigned to CVE-2025-15056 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2025-15056?

CVE-2025-15056 affects the following packages: quill (npm). Ecosystems affected: npm.

How do I fix CVE-2025-15056?

The records we use list no patched version of quill for CVE-2025-15056. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

How do I detect CVE-2025-15056 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for quill, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2025-15056 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2025-15056 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-15056 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2025-15056?

CVE-2025-15056 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 19th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2025-15056?

CVE-2025-15056 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2025-15056 published, and has it been updated?

CVE-2025-15056 was published on January 13, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2025-15056 — quill

CVE-2025-15056 is a Cross-site Scripting (XSS) vulnerability in quill. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Quill 2.0.3 - Lack of data validation in HTML export allowing XSS

Also known asGHSA-v3m3-f69x-jf25

Published

Jan 13, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

See advisory

Exploits

None indexed

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-15056.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs19th percentile — riskier than 19% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

2Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream

quillnpm

8.7Mdownloads / week

Description

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.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
📦npm	`quill`	all versions	No fix

Affected Products

1 product · 1 configurations

Application

quillslab

1 version

2.0.3

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for quill, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of quill for CVE-2025-15056. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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