CVE-2024-29881 TinyMCE Cross-Site Scripting (XSS) vulnerability in handling external SVG files through Object or Embed elements

Medium 4.3 Published 26 Mar 2024 Updated 2 Aug 2024

Attackers can execute arbitrary scripts via malicious SVG files in TinyMCE, potentially compromising user sessions and data.

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-2024-29881?

CVE-2024-29881 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 loading and content inserting code. A SVG image could be loaded though an `object` or `embed` element and that image could potentially contain a XSS payload. This vulnerability is fixed in 6.8.1 and 7.0.0.

Weakness: CWE-79

Which versions are affected by CVE-2024-29881?

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	`7.0.0`
`TinyMCE` NuGet	All versions	`7.0.0`
`tinymce/tinymce` Packagist	All versions	`7.0.0`
`tinymce/tinymce` Packagist	All versions	`7.0.0`
`tinymce` npm	All versions	`7.0.0`
`tinymce` npm	All versions	`7.0.0`

Products include Tiny Tinymce.

How do I fix CVE-2024-29881?

Upgrade TinyMCE to 7.0.0 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-2024-29881 being exploited?

There is no known exploitation of CVE-2024-29881 in the wild and no public exploit code.

Sources

Also known as CLEANSTART-2026-QW90668, CLSA-2026-1775262593, GHSA-5359-pvf2-pw78, UBUNTU-CVE-2024-29881.