CVE-2023-45819 Cross-site Scripting vulnerability in TinyMCE notificationManager.open API
Attackers can execute arbitrary JavaScript via unfiltered HTML in TinyMCE notifications, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-45819?
CVE-2023-45819 is a medium-severity cross-site scripting vulnerability in tinymce, published on 19 Oct 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2023-45819?
12 open source packages ship an affected version, including TinyMCE, tinymce/tinymce and tinymce. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
TinyMCE NuGet | All versions | 5.10.8 |
TinyMCE NuGet | All versions | 5.10.8 |
TinyMCE NuGet | From 6.0.0 | 6.7.1 |
TinyMCE NuGet | From 6.0.0 | 6.7.1 |
tinymce/tinymce Packagist | All versions | 5.10.8 |
tinymce/tinymce Packagist | All versions | 5.10.8 |
6 more packages
tinymce/tinymce Packagist | From 6.0.0 | 6.7.1 |
tinymce/tinymce Packagist | From 6.0.0 | 6.7.1 |
tinymce npm | All versions | 5.10.8 |
tinymce npm | All versions | 5.10.8 |
tinymce npm | From 6.0.0 | 6.7.1 |
tinymce npm | From 6.0.0 | 6.7.1 |
Products include Tiny Tinymce.
How do I fix CVE-2023-45819?
Upgrade TinyMCE to a fixed version for your release line: 5.10.8 or 6.7.1.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2023-45819 being exploited?
There is no known exploitation of CVE-2023-45819 in the wild and no public exploit code.
Other vulnerabilities in tinymce
- CVE-2026-47759 TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes
- CVE-2026-47760 TinyMCE Cross-Site Scripting (XSS) vulnerability using sanitization bypass through nested SVGs
- CVE-2026-47761 TinyMCE Cross-Site Scripting (XSS) vulnerability using media plugin `data-mce-object` injection
- CVE-2026-47762 TinyMCE Cross-Site Scripting (XSS) vulnerability through `mce:protected` comments
- CVE-2024-21908 Cross-site scripting vulnerability in TinyMCE
Sources
Also known as GHSA-hgqx-r2hp-jr38, UBUNTU-CVE-2023-45819.