Not only is the bug dangerous, but it is being exploited by hackers.
The update will bring your browser to version 104.0.5 112.101 on Mac and Linux and version 104.0.5 112.101 on Windows. If it hasn't been installed on your browser, you can initiate the update by going to the About menu.
The company usually restricts bug details until most users have updated their software, so it didn't release much information about the most critical issue.
It has to do with insufficient validation of untrusted input in Intents, which could lead to a malicious website executing arbitrary code on your machine, among other problems.
There is an exploit for CVE-2022-2856 that exists in the wild. It's important that you update your browser as soon as possible because there are hackers using this bug for bad things.