CVE-2024-29203 TinyMCE Cross-Site Scripting (XSS) vulnerability in handling iframes
Attackers can inject malicious iframes into TinyMCE editors, triggering asset downloads or other operations via same-origin protections.
- 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-2024-29203?
CVE-2024-29203 is a medium-severity cross-site scripting vulnerability in tinymce, published on 26 Mar 2024. 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 content insertion code. This allowed `iframe` elements containing malicious code to execute when inserted into the editor. These `iframe` elements are restricted in their permissions by same-origin browser protections, but could still trigger operations such as downloading of malicious assets. This vulnerability is fixed in 6.8.1.
Weakness: CWE-79
Which versions are affected by CVE-2024-29203?
6 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 | 6.8.1 |
TinyMCE NuGet | All versions | 6.8.1 |
tinymce/tinymce Packagist | All versions | 6.8.1 |
tinymce/tinymce Packagist | All versions | 6.8.1 |
tinymce npm | All versions | 6.8.1 |
tinymce npm | All versions | 6.8.1 |
Products include Tiny Tinymce.
How do I fix CVE-2024-29203?
Upgrade TinyMCE to 6.8.1 or later.
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-2024-29203 being exploited?
There is no known exploitation of CVE-2024-29203 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-438c-3975-5x3f, UBUNTU-CVE-2024-29203.