Multiple buffer overflows in (1) iso2022jp.c or (2) shiftjis.c for Courier-IMAP before 3.0.0, Courier before 0.45, and SqWebMail before 4.0.0 may allow remote attackers to execute arbitrary code "when Unicode character is out of BMP range."

Cross-site scripting (XSS) vulnerability in the print_header_uc function for SqWebMail 4.0.4 and earlier, and possibly 3.x, allows remote attackers to inject arbitrary web script or HRML via (1) e-mail headers or (2) a message with a "message/delivery-status" MIME Content-Type.

Inter7 SqWebMail 3.4.1 through 3.6.1 generates different error messages for incorrect passwords versus correct passwords on non-mail-enabled accounts (such as root), which allows remote attackers to guess the root password via brute force attacks.

SqWebMail allows remote attackers to inject arbitrary web script or HTML via CRLF sequences in the redirect parameter followed by the desired script or HTML.

Cross-site scripting (XSS) vulnerability in SqWebMail 5.0.4 allows remote attackers to inject arbitrary web script or HTML via a file attachment that is processed by the Display feature. NOTE: the severity of this issue has been disputed by the developer.

Cross-site scripting (XSS) vulnerability in SqWebMail 5.0.4 and possibly other versions allows remote attackers to inject arbitrary web script or HTML via an HTML e-mail containing tags with strings that contain ">" or other special characters, which is not properly sanitized by SqWebMail.

Cross-site scripting (XSS) vulnerability in SqWebMail 5.0.4 allows remote attackers to inject arbitrary web script or HTML via an e-mail message containing Internet Explorer "Conditional Comments" such as "[if]" and "[endif]".