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The STARTTLS implementation in Cyrus IMAP Server before 2.4.7 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.
Use CWE-264, Cmu vendor hub and Cyrus Imap Server product page to widen CVE-2011-1926 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2011-3208, CVE-2009-2632 and CVE-2011-3481 for nearby disclosures in the same product family.