This is very similar to 2.6.1 but fixes some problem with a missing admin 
file (also fixed in 2.6.2) and a potential DoS security issue.

The issue was first discovered in 
Django https://www.djangoproject.com/weblog/2013/sep/15/security/ 
We thank them for discovering and reporting it.

In web2py 2.5.x and earlier we suffer from the same problem. This is 
because while the default password validator checks for length, the check 
is performed after hashing, before inserting the hashed password in 
database. In 2.6.1/2 we have a different implementation of the hashing 
algorithm and we do not know how severe the problem is.

In any case 2.6.3 fixes the problem by truncating the password to 1024 
chars when passed to the CRYPT validator.

You should upgrade.

Massimo

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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