can u re-install grapheneos?

teslapower

new in the community and to grapheneos.
i have a doubt, can you reinstall grapheneos for security reasons or is unnecessary due to the way is built?
I made the question because i have a security concern and was thinking, is possible that a web page can have access to your system just by accepting cookies or the web page can access anything out side the browser sandbox?
I think that most likely the answer is no but want to ask to anyone with more experience.

Eumenia

teslapower I made the question because i have a security concern and was thinking, is possible that a web page can have access to your system just by accepting cookies or the web page can access anything out side the browser sandbox?

That some random website has such a strong chain off zero day exploits that it

Escapes the page sandbox provided by the browser
Then escapes the app sandbox provided by Android
Is very unlikely

W1zardK1ng

teslapower If you are targeted by national agencies and they know any 0 days visiting some links may compromise your device, in this case if you are concerned, clear the data of your web browser it will clear all cookies and site settings.

If you reset the phone, that should clear everything even your phone is compromised, highly unlikely in your case.

If you are paranoid you can reinstall GrapheneOS from the website but it's unnecessary because a reset should be enough but still if you want to reinstall the OS, yes you can do it.

NoahRaketic

There really would never be a security reason to re-install GrapheneOS. Android Verified Boot covers everything from the bootloader to the OS, and on GrapheneOS this includes system apps, so if your system is tampered, the boot process will fail.

Cookies have absolutely nothing to do with exploit protections, and accepting cookies does not make you vulnerable in any way. To infect the host, someone would need a both browser escape and a sandbox escape, which is extremely difficult on Android, and especially on GrapheneOS with Vanadium.

The vast majority of mobile malware is temporary, so you can simply reboot if you think you are infected, and AVB will re-measure everything.