CVE-2024-21911 Cross-site scripting vulnerability in TinyMCE
An attacker can inject malicious HTML into TinyMCE, leading to arbitrary JavaScript execution in other users' browsers.
- 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-2024-21911?
CVE-2024-21911 is a medium-severity cross-site scripting vulnerability in tiny:tinymce, published on 3 Jan 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 versions before 5.6.0 are affected by a stored cross-site scripting vulnerability. An unauthenticated and remote attacker could insert crafted HTML into the editor resulting in arbitrary JavaScript execution in another user's browser.
Weakness: CWE-79
Which versions are affected by CVE-2024-21911?
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 | 5.6.0 |
TinyMCE NuGet | All versions | 5.6.0 |
tinymce/tinymce Packagist | All versions | 5.6.0 |
tinymce/tinymce Packagist | All versions | 5.6.0 |
tinymce npm | All versions | 5.6.0 |
tinymce npm | All versions | 5.6.0 |
Products include Tiny Tinymce.
How do I fix CVE-2024-21911?
Upgrade TinyMCE to 5.6.0 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-2024-21911 being exploited?
There is no known exploitation of CVE-2024-21911 in the wild and no public exploit code.
Other vulnerabilities in tiny: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-w7jx-j77m-wp65, UBUNTU-CVE-2024-21911.