CVE-2019-17003 Cross-site scripting in Firefox for iOS

Medium 6.1 Published 16 Feb 2023 Updated 19 Mar 2025

Scanning a QR code with a javascript URL executes the script, allowing attackers to run arbitrary code in the browser context.

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: None listed

What is CVE-2019-17003?

CVE-2019-17003 is a medium-severity cross-site scripting vulnerability in Mozilla Firefox Mobile, published on 16 Feb 2023. 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

Scanning a QR code that contained a javascript: URL would have resulted in the Javascript being executed.

Weakness: CWE-79

Which versions are affected by CVE-2019-17003?

It affects 1 product.

Products include Mozilla Firefox Mobile.

How do I fix CVE-2019-17003?

No fix has been published for CVE-2019-17003 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-2019-17003 being exploited?

There is no known exploitation of CVE-2019-17003 in the wild and no public exploit code.

All Mozilla Firefox Mobile vulnerabilities

Sources

Also known as GHSA-2q49-5v6q-6qr6.