CVE-2024-38356 TinyMCE Cross-Site Scripting (XSS) vulnerability using noneditable_regexp option
Attackers can execute arbitrary scripts via crafted HTML attributes when the noneditable_regexp option is enabled in TinyMCE.
- 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-2024-38356?
CVE-2024-38356 is a medium-severity cross-site scripting vulnerability in tinymce, published on 19 Jun 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 extraction code. When using the `noneditable_regexp` option, specially crafted HTML attributes containing malicious code were able to be executed when content was extracted from the editor. This vulnerability has been patched in TinyMCE 7.2.0, TinyMCE 6.8.4 and TinyMCE 5.11.0 LTS by ensuring that, when using the `noneditable_regexp` option, any content within an attribute is properly verified to match the configured regular expression before being added. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Weakness: CWE-79
Which versions are affected by CVE-2024-38356?
21 open source packages ship an affected version, including TinyMCE, tinymce/tinymce and django-tinymce.
| Package | Affected | Fixed in |
|---|---|---|
TinyMCE NuGet | All versions | 5.11.0 |
TinyMCE NuGet | All versions | 5.11.0 |
TinyMCE NuGet | From 6.0.0 | 6.8.4 |
TinyMCE NuGet | From 6.0.0 | 6.8.4 |
TinyMCE NuGet | From 7.0.0 | 7.2.0 |
TinyMCE NuGet | From 7.0.0 | 7.2.0 |
15 more packages
tinymce/tinymce Packagist | All versions | 5.11.0 |
tinymce/tinymce Packagist | All versions | 5.11.0 |
tinymce/tinymce Packagist | From 6.0.0 | 6.8.4 |
tinymce/tinymce Packagist | From 6.0.0 | 6.8.4 |
tinymce/tinymce Packagist | From 7.0.0 | 7.2.0 |
tinymce/tinymce Packagist | From 7.0.0 | 7.2.0 |
django-tinymce PyPI | All versions | 4.1.0 |
django-tinymce PyPI | All versions | 4.1.0 |
django-tinymce PyPI | All versions | 4.1.0 |
tinymce npm | All versions | 5.11.0 |
tinymce npm | All versions | 5.11.0 |
tinymce npm | From 6.0.0 | 6.8.4 |
tinymce npm | From 6.0.0 | 6.8.4 |
tinymce npm | From 7.0.0 | 7.2.0 |
tinymce npm | From 7.0.0 | 7.2.0 |
How do I fix CVE-2024-38356?
Upgrade TinyMCE to a fixed version for your release line: 5.11.0, 6.8.4 or 7.2.0.
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-2024-38356 being exploited?
There is no known exploitation of CVE-2024-38356 in the wild and no public exploit code.
Sources
Also known as GHSA-9hcv-j9pv-qmph, PYSEC-2026-1301, UBUNTU-CVE-2024-38356.