CVE-2021-43544 Cross-site scripting in Firefox
Firefox for Android users are vulnerable to XSS and spoofing when URLs from SEND intents are unintentionally loaded in the address bar.
- 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-2021-43544?
CVE-2021-43544 is a medium-severity cross-site scripting vulnerability in Mozilla Firefox, published on 8 Dec 2021. 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
When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent usages of the address bar might have caused the URL to load unintentionally, which could lead to XSS and spoofing attacks. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 95.
Weakness: CWE-79
Which versions are affected by CVE-2021-43544?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2021-43544?
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-2021-43544 being exploited?
There is no known exploitation of CVE-2021-43544 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-7w2r-8gq9-28xx.