Are these two from the same maintainer? If not, considering that they both use Firefox Android as their base, does this mean there is a vulnerability in Firefox Android?
There was and it was fixed by the looks of it. Guessing these apps have not urgently pulled the fixes in and released an update, so F-droid is urging people not to use the apps until so
Yes, there was a remote code execution vulnerability in the CSS engine of firefox a little while ago. If you're on desktop version 131 or lower, update to 131.0.3 when possible. I don't know how the versioning works for the Android versions here...
I don't know how the versioning works for the Android versions here...
Android has the same versions as desktop here, which is why there is no differentiation. The main chunk of firefox is platform independent (and even used in thunderbird too).
So any firefox android app and fork thereof needs that version 131.0.3+ too (unless it is esr which is 128 currently).