Sure, you can always access them trough the Insights tab of your repository.
I'm trying to find out how to reopen a dismissed security alert, but can't find it on the link you provided. Any chance to provide instructions more clearlY?
On a repository page you have several tabs, like Code and Pull requests for example. Head over to Insights to find the security alerts.
@wrk4all as you can see at the responses above, you are always able to view past security issues.
Could you elaborate on what you mean by "reinstating" dismissed ones?
The topic of this thread is about reopening/resintating a dismissed security alerts (Not notifications). So i asked if a way to reinstated the dismssied alerts has been found. (See below)
Thank you :)