Open Ticket Request System (OTRS) before 2.2.7 sends e-mail containing a Bcc header field that lists the Blind Carbon Copy recipients, which allows remote attackers to obtain potentially sensitive e-mail address information by reading this field.

Kernel/System/EmailParser.pm in PostmasterPOP3.pl in Open Ticket Request System (OTRS) before 2.2.7 does not properly handle e-mail messages containing malformed UTF-8 characters, which allows remote attackers to cause a denial of service (e-mail retrieval outage) via a crafted message.

The CustomerInterface component in Open Ticket Request System (OTRS) before 2.2.8 allows remote authenticated users to bypass intended access restrictions and access tickets of arbitrary customers via unspecified vectors.

The S/MIME feature in Open Ticket Request System (OTRS) before 2.2.5, and 2.3.x before 2.3.0-beta1, does not properly configure the RANDFILE environment variable for OpenSSL, which might make it easier for remote attackers to decrypt e-mail messages that had lower than intended entropy available for cryptographic operations, related to inability to write to the seeding file.

Open Ticket Request System (OTRS) before 2.3.0-beta4 checks for the rw permission, instead of the configured merge permission, during authorization of merge operations, which might allow remote authenticated users to bypass intended access restrictions by merging two tickets.

Kernel/System/Web/Request.pm in Open Ticket Request System (OTRS) before 2.3.2 creates a directory under /tmp/ with 1274 permissions, which might allow local users to bypass intended access restrictions via standard filesystem operations, related to incorrect interpretation of 0700 as a decimal value.

Multiple cross-site scripting (XSS) vulnerabilities in Open Ticket Request System (OTRS) before 2.3.3 allow remote attackers to inject arbitrary web script or HTML via vectors related to (1) AgentTicketMailbox or (2) CustomerTicketOverView.

webscript.pl in Open Ticket Request System (OTRS) 2.3.4 and earlier allows remote attackers to execute arbitrary commands via unspecified vectors, related to a "command injection vulnerability."