A security weakness has been identified in WordPress, which could potentially be exploited by attackers to bypass security restrictions. This issue is caused due to the application using cookie values based on the MD5 hash of a password MD5 hash, which could be exploited by an attacker with read access to the "wp_user" table of a database to gain unauthorized administrative access to a vulnerable application [...]
References
http://www.frsirt.com/english/advisories/2007/3941
http://www.cl.cam.ac.uk/~sjm217/advisories/wordpress-cookie-auth.txt
Credits
Vulnerability reported by Steven J. Murdoch.
ChangeLog
2007-11-21 : Initial release
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