Versions of FOSUserBundle prior to 1.2.1 have been found to be vulnerable to a security issue related to user identity validation. Specifically, user refreshing was performed using the primary key instead of the username, leading to a potential security risk if a user is allowed to change their username. The fix in version 1.2.1 addresses this issue by loading the user using the primary key during refreshing.

References

• FriendsOfSymfony/FOSUserBundle@5a36e29
• https://github.com/FriendsOfPHP/security-advisories/blob/master/friendsofsymfony/user-bundle/2012-07-10-1.yaml
• https://github.com/FriendsOfSymfony/FOSUserBundle/blob/master/Changelog.md