EMC RSA Security SiteKey allows remote attackers to display the correct image via a man-in-the-middle (MITM) attack in which an attacker-controlled server proxies authentication data to and from a legitimate SiteKey server. NOTE: the vendor disputes the severity of the issue, stating that it is easier to monitor this attack than "attacks against static web pages."

EMC RSA Security SiteKey issues challenge-bypass tokens that persist forever without a cancellation interface for end users, which makes it easier for attackers to bypass one stage of authentication by stealing and replaying a token.

EMC RSA Security SiteKey does not set the secure qualifier on the SiteKey Flash token (aka the PassMark Flash shared object), which might allow remote attackers to obtain the token via HTTP.