http://simonwillison.net/2009-04-23T15:06:13+00:00Simon Willison2009-04-23T15:06:13+00:002009-04-23T15:06:13+00:00https://simonwillison.net/2009/Apr/23/oauth/#atom-tag

<p><strong><a href="http://oauth.net/advisories/2009-1">OAuth Security Advisory 2009.1</a></strong></p> It’s a show-stopper: an attacker can start an OAuth permission request flow from a consumer site, then trick another user from the same site in to completing that flow and hence authorising the attacker to act on their behalf. A fix to the spec is forthcoming; in the meantime, don’t start an OAuth flow from an untrusted location. <p>Tags: <a href="https://simonwillison.net/tags/ouath">ouath</a>, <a href="https://simonwillison.net/tags/security">security</a>, <a href="https://simonwillison.net/tags/sessionfixation">sessionfixation</a></p>