tl;dr: very significant PHP vulnerability, but the wikis are ok As a precaution against the PHP2Shell vulnerability announced today, we turned off the webservers for all of the wikis hosted by Weird Gloop, until a patch was released 2 hours ago. This 13-hour downtime was the longest outage we’ve ever had. However, thanks to very aggressive caching, we were able to keep about 94% of wiki pageviews serving correctly, even with no database or PHP running.