CVE-2016-4027: An issue was discovered in Open-Xchange OX App Suite before 7.8.1-rev10. App Suite frontend offers to control whether a user wants to store cookies th...

Description

An issue was discovered in Open-Xchange OX App Suite before 7.8.1-rev10. App Suite frontend offers to control whether a user wants to store cookies that exceed the session duration. This functionality is useful when logging in from clients with reduced privileges or shared environments. However the setting was incorrectly recognized and cookies were stored regardless of this setting when the login was performed using a non-interactive login method. In case the setting was enforced by middleware configuration or the user went through the interactive login page, the workflow was correct. Cookies with authentication information may become available to other users on shared environments. In case the user did not properly log out from the session, third parties with access to the same client can access a user's account.

Metrics

EPSS Probability

1.07%

60.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions	Update
Open-Xchange	Open-Xchange Appsuite	<= 7.8.1	Rev9

References

http://packetstormsecurity.com/files/137599/Open-Xchange-App-Suite-7.8.1-Information-Disclosure.htmlThird Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/538732/100/0/threaded
http://www.securitytracker.com/id/1036157Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/137599/Open-Xchange-App-Suite-7.8.1-Information-Disclosure.htmlThird Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/538732/100/0/threaded
http://www.securitytracker.com/id/1036157Third Party Advisory, VDB Entry

Timeline

Published: Dec 15, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-4027?

An issue was discovered in Open-Xchange OX App Suite before 7.8.1-rev10. App Suite frontend offers to control whether a user wants to store cookies that exceed the session duration. This functionality is useful when logging in from clients with reduced privileges or shared environments. However the setting was incorrectly recognized and cookies were stored regardless of this setting when the login was performed using a non-interactive login method. In case the setting was enforced by middleware configuration or the user went through the interactive login page, the workflow was correct. Cookies with authentication information may become available to other users on shared environments. In case the user did not properly log out from the session, third parties with access to the same client can access a user's account.

How severe is CVE-2016-4027?

Severity scoring for CVE-2016-4027 is pending analysis. The EPSS model estimates a 1.07% probability of exploitation in the next 30 days.

How do I fix CVE-2016-4027?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.