Sleipnir 4 Black Edition for Mac 4.5.3 and earlier and Sleipnir 4 for Mac 4.5.3 and earlier (Mac App Store) may allow a remote attacker to spoof the URL display via a specially crafted webpage.

Multiple unspecified vulnerabilities in Fenrir Inc. ActiveGeckoBrowser 1.0.0 and 1.0.5 alpha, a module for the Sleipnir web browser, allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unknown vectors related to the Gecko engine.

Cross-zone scripting vulnerability in Sleipnir 2.49 and earlier, and Portable Sleipnir 2.45 and earlier, allows remote attackers to bypass Web content zone restrictions via certain script contained in RSS data. NOTE: some of these details are obtained from third party information.