Interpretation conflict in the MagicHTML filter in SquirrelMail 1.4.0 to 1.4.5 allows remote attackers to conduct cross-site scripting (XSS) attacks via style sheet specifiers with invalid (1) "/" and "/" comments, or (2) a newline in a "url" specifier, which is processed by certain web browsers including Internet Explorer.
No PoCs found on GitHub currently.