CVE-2019-8503 Cross-site scripting in Safari
A malicious website can execute scripts in the context of another website, allowing attackers to bypass security boundaries in Apple browsers and related software.
- 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-2019-8503?
CVE-2019-8503 is a high-severity cross-site scripting vulnerability in Apple Icloud, published on 18 Dec 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
A logic issue was addressed with improved validation. This issue is fixed in iOS 12.2, tvOS 12.2, Safari 12.1, iTunes 12.9.4 for Windows, iCloud for Windows 7.11. A malicious website may be able to execute scripts in the context of another website.
Weakness: CWE-20
Which versions are affected by CVE-2019-8503?
It affects 5 products.
Products include Apple Icloud, Apple Iphone Os, Apple Itunes, Apple Safari, Apple Tvos.
How do I fix CVE-2019-8503?
Upgrade to a fixed version.
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-2019-8503 being exploited?
There is no known exploitation of CVE-2019-8503 in the wild and no public exploit code.
Other vulnerabilities in Apple Icloud
Sources
Also known as DEBIAN-CVE-2019-8503, GHSA-66q9-mrhp-9hrp, UBUNTU-CVE-2019-8503.