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Roundcube Webmail allows arbitrary password resets by authenticated users. This affects versions before 1.0.11, 1.1.x before 1.1.9, and 1.2.x before 1.2.5. The problem is caused by an improperly restricted exec call in the virtualmin and sasl drivers of the password plugin. External References: https://roundcube.net/news/2017/04/28/security-updates-1.2.5-1.1.9-and-1.0.11
Created roundcubemail tracking bugs for this issue: Affects: epel-6 [bug 1448401]
This was fixed 3 years ago. Closing.