CVE-2020-12648 Cross-site scripting vulnerability in TinyMCE

Medium 6.1 Published 14 Aug 2020 Updated 4 Aug 2024

Remote attackers can inject arbitrary web script into TinyMCE when classic editing mode is enabled, potentially compromising user sessions.

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-2020-12648?

CVE-2020-12648 is a medium-severity cross-site scripting vulnerability in n/a, published on 14 Aug 2020. 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

A cross-site scripting (XSS) vulnerability in TinyMCE 5.2.1 and earlier allows remote attackers to inject arbitrary web script when configured in classic editing mode.

Weakness: CWE-79

Which versions are affected by CVE-2020-12648?

4 open source packages ship an affected version, including tinymce. It affects 1 product.

Package	Affected	Fixed in
`tinymce` npm	All versions	`4.9.11`
`tinymce` npm	All versions	`4.9.11`
`tinymce` npm	From `5.0.0`	`5.4.1`
`tinymce` npm	From `5.0.0`	`5.4.1`

Products include Tiny Tinymce.

How do I fix CVE-2020-12648?

Upgrade tinymce to a fixed version for your release line: 4.9.11 or 5.4.1.

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-2020-12648 being exploited?

There is no known exploitation of CVE-2020-12648 in the wild and no public exploit code.

Sources

Also known as GHSA-vrv8-v4w8-f95h, UBUNTU-CVE-2020-12648.