# CVE-2025-15056: Slab Quill XSS in HTML export feature

Source: https://junglewise.ai/threats/cve-2025-15056-slab-quill-xss-in-html-export-feature  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-01-13. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2025-15056 · Severity: medium · CVSS 6.1 · Published 2026-01-13

Quill is a popular web-based text editor used to provide rich text editing capabilities in applications. A security flaw in its HTML export feature allows an attacker to inject malicious scripts into content. If a user views or processes this exported content, the script could execute in their browser, potentially leading to unauthorized actions or data theft.

Technologies: [quill (npm)](https://junglewise.ai/threats/technologies/quill). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2025-15056 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-15056 being exploited in the wild.

**How severe is CVE-2025-15056?** Medium severity, with a CVSS score of 6.1, published 13 January 2026.

**Which products and versions are affected?** quill (npm) = 2.0.3.

**Is there a fix for CVE-2025-15056?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-15056 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-15056?** Check whether you run quill (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Cross-Site Scripting (XSS) vulnerability exists in Quill version 2.0.3 due to improper neutralization of input during web page generation (CWE-79) within the HTML export functionality. The root cause is a lack of sufficient data validation when the editor constructs HTML output from user-influenced content. An attacker can exploit this by crafting malicious input that, when exported and subsequently rendered in a victim's browser, executes arbitrary JavaScript. This attack requires user interaction (viewing the exported content) and can lead to a compromise of the integrity and confidentiality of the user's session. As of the advisory date, no patched version has been identified.

## Affected products

- slab quill 2.0.3

## Identifiers

- CVE-2025-15056
- GHSA-v3m3-f69x-jf25

## Timeline

- 2026-01-13: disclosed: Vulnerability disclosed and CVE-2025-15056 assigned.
- 2026-01-13: advisory: GitHub Advisory GHSA-v3m3-f69x-jf25 published.

## References

- [https://fluidattacks.com/advisories/diomedes](https://fluidattacks.com/advisories/diomedes)
- [https://github.com/slab/quill](https://github.com/slab/quill)

## Related threats

- [Quill stored cross-site scripting via crafted image tag](https://junglewise.ai/threats/cve-2021-3163-quill-stored-cross-site-scripting-via-crafted-image-tag)
- [Quill reverse tabnabbing via anchor links](https://junglewise.ai/threats/quill-reverse-tabnabbing-via-anchor-links-046ad113)