It's possible to create a user with a password that will not work on login

[davidmixer]

When i'm assigning the password OTmoP3ku8BZVWp to a user, worpress says it's very strong and it doesn't reject it in any way. When this user later tries to log in into the wp-admin, the user login data is not accepted. When i'm shortening the password, it works as expected.

[SergeyBiryukov]

Could not reproduce with your password example neither in 3.5.1 nor in 3.6-beta1.

Have you tested on a clean install (with Twenty Twelve or Twenty Eleven theme activated and all plugins disabled)?

[davidmixer]

You're right. I've tested the behaviour mentioned above with several of our corporate WP installations. The Bug occurs in all of them - except of one that is not using all plugins the others have in common. I wasn't expecting that a plugin is allowed to change WPs login behaviour.

Well, when i have some free time, i'll figure out which plugin causes the problem and inform the responsible developer.

Thank you!