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Is it a security risk to myself that I am not logging out of Twitter, Facebook, StackExchange, and a majority of the sites which I am using? Is there a chance for someone to hijack my session or cause damage to any of my online accounts?

For my situation, I am limiting all of the damage I can by running a VPN and trying to access all websites using https://. I know a lot of users do not do this, so there might be even more risk for them to stay logged in, but also for me, there still may be risk.

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Yes, there is a risk - Cross-Site Request Forgeries. This attack ignores any encryption you apply to the channel between yourself and the web site by getting your browser (which holds the authentication cookie(s)) to submit a request to the vulnerable web site.

Though, in your favor, you would have to view some poisoned content to trigger the attack. The poisoned content could take the form of a link in a phishing email or a website serving an image tag with a malicious src.

It isn't exactly session hijacking (the attacker does not get to see the response(s) from the vulnerable web site), but it's close.

https://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29

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