CVE-2022-21158 Cross-site scripting in MarkText

Medium 5.4 Published 7 Mar 2022 Updated 3 Aug 2024

Attackers can execute arbitrary scripts on user machines via malicious links in MarkText documents, requiring an upgrade to secure the application.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2022-21158?

CVE-2022-21158 is a medium-severity cross-site scripting vulnerability in MarkText, published on 7 Mar 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

A stored cross-site scripting vulnerability in marktext versions prior to v0.17.0 due to improper handling of the link (with javascript: scheme) inside the document may allow an attacker to execute an arbitrary script on the PC of the user using marktext.

Weakness: CWE-79

Which versions are affected by CVE-2022-21158?

It affects 1 product.

Products include Marktext Marktext.

How do I fix CVE-2022-21158?

No fix has been published for CVE-2022-21158 yet. Limit exposure of the affected software until one is available.

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-2022-21158 being exploited?

There is no known exploitation of CVE-2022-21158 in the wild and no public exploit code.

Sources

Also known as GHSA-xfpv-q4q6-7j43.