cve/2024/CVE-2024-40626.md

### [CVE-2024-40626](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40626)
![](https://img.shields.io/static/v1?label=Product&message=outline&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%200.77.3%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-79%3A%20Improper%20Neutralization%20of%20Input%20During%20Web%20Page%20Generation%20('Cross-site%20Scripting')&color=brighgreen)

### Description

Outline is an open source, collaborative document editor. A type confusion issue was found in ProseMirror’s rendering process that leads to a Stored Cross-Site Scripting (XSS) vulnerability in Outline. An authenticated user can create a document containing a malicious JavaScript payload. When other users view this document, the malicious Javascript can execute in the origin of Outline. Outline includes CSP rules to prevent third-party code execution, however in the case of self-hosting and having your file storage on the same domain as Outline a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions. This issue has been addressed in release version 0.77.3. Users are advised to upgrade. There are no known workarounds for this vulnerability.

### POC

#### Reference
- https://github.com/outline/outline/security/advisories/GHSA-888c-mvg8-v6wh

#### Github
No PoCs found on GitHub currently.