Kolab stores OpenLDAP passwords in plaintext in the slapd.conf file, which may be installed world-readable, which allows local users to gain privileges.

Kolab Server 2.0.0 and 2.0.1 does not properly handle when a large email is sent with a "." in the wrong place, which causes kolabfilter to add another ".", which might break clear-text signatures and attachments. NOTE: it is not clear whether this issue crosses privilege boundaries, so this might not be a vulnerability.

Kolab Server 2.0.1, 2.0.2 and development versions pre-2.1-20051215 and earlier, when authenticating users via secure SMTP, stores authentication credentials in plaintext in the postfix.log file, which allows local users to gain privileges.

Unspecified vulnerability in Kolab Webclient before 1.2.0 in Kolab Server before 2.2.3 allows attackers to have an unspecified impact via vectors related to an "image upload form."