An issue was discovered in Open-Xchange OX App Suite before 7.8.2-rev8. Script code within hyperlinks at HTML E-Mails is not getting correctly sanitized when using base64 encoded "data" resources. This allows an attacker to provide hyperlinks that may execute script code instead of directing to a proper location. Malicious script code can be executed within a user's context. This can lead to session hijacking or triggering unwanted actions via the web interface (sending mail, deleting data etc.).

References

• https://nvd.nist.gov/vuln/detail/CVE-2016-6845
• https://software.open-xchange.com/OX6/6.22/doc/Release_Notes_for_Patch_Release_3522_7.8.2_2016-08-29.pdf
• http://www.securityfocus.com/bid/93457