CVE-2026-12322 Clickjacking issue in the Widget: Gtk component
A clickjacking vulnerability in the Gtk widget component allows attackers to trick users into unintended actions, requiring an upgrade to Firefox or Thunderbird.
- 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-2026-12322?
CVE-2026-12322 is a medium-severity vulnerability in Mozilla Firefox, published on 16 Jun 2026. 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
Clickjacking issue in the Widget: Gtk component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
Weakness: CWE-1021
Which versions are affected by CVE-2026-12322?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2026-12322?
Upgrade to a fixed version.
Is CVE-2026-12322 being exploited?
There is no known exploitation of CVE-2026-12322 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-fm4m-52gr-mp53, UBUNTU-CVE-2026-12322.