CVE-2019-12043 Cross-site Scripting in remarkable

Medium 6.1 Published 13 May 2019 Updated 4 Aug 2024

Attackers can execute arbitrary JavaScript via unprintable characters in URLs due to improper filtering in the remarkable markdown parser.

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-2019-12043?

CVE-2019-12043 is a medium-severity cross-site scripting vulnerability in n/a, published on 13 May 2019. 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

In remarkable 1.7.1, lib/parser_inline.js mishandles URL filtering, which allows attackers to trigger XSS via unprintable characters, as demonstrated by a \x0ejavascript: URL.

Weakness: CWE-79

Which versions are affected by CVE-2019-12043?

2 open source packages ship an affected version, including remarkable. It affects 1 product.

Package	Affected	Fixed in
`remarkable` npm	All versions	`1.7.2`
`remarkable` npm	All versions	`1.7.2`

Products include Remarkable Project Remarkable.

How do I fix CVE-2019-12043?

Upgrade remarkable to 1.7.2 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-2019-12043 being exploited?

There is no known exploitation of CVE-2019-12043 in the wild and no public exploit code.

Sources

Also known as GHSA-36m4-6v6m-4vpr.