CVE-2023-45819 PoC — Cross-site Scripting vulnerability in TinyMCE notificationManager.open API

Source

https://github.com/philipsinnott/cve-2023-45819

Associated Vulnerability

Title: Cross-site Scripting vulnerability in TinyMCE notificationManager.open API (CVE-2023-45819)
Description:TinyMCE is an open source rich text editor. A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s Notification Manager API. The vulnerability exploits TinyMCE's unfiltered notification system, which is used in error handling. The conditions for this exploit requires carefully crafted malicious content to have been inserted into the editor and a notification to have been triggered. When a notification was opened, the HTML within the text argument was displayed unfiltered in the notification. The vulnerability allowed arbitrary JavaScript execution when an notification presented in the TinyMCE UI for the current user. This issue could also be exploited by any integration which uses a TinyMCE notification to display unfiltered HTML content. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring that the HTML displayed in the notification is sanitized, preventing the exploit. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Description

Proof of concept for CVE-2023-45819

Readme

# PoC
1) Click on the “Insert/edit image” button

2) In “Source”, enter the following payload:
```html
blob:<img src=x onerror=alert(document.domain)>
```
## Details
For details, see https://philipsinnott.com/posts/cve-2023-45819/

File Snapshot

Remarks

1. It is advised to access via the original source first.

2. Local POC snapshots are reserved for subscribers — if the original source is unavailable, the local mirror is part of the paid plan.

View subscription plans →