CVE-2016-6851

Name: CVE-2016-6851
Creator: NVD / NIST
Published: 2016-12-15T06:59:22.58+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.64%

Last modified Jun 17, 2026

CVE-2016-6851 is a vulnerability of currently unknown severity. An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. Script code can be provided as parameter to the OX Guard guest reader web application. EPSS estimates a 2.64% chance of exploitation in the next 30 days.

Description

An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. Script code can be provided as parameter to the OX Guard guest reader web application. This allows cross-site scripting attacks against arbitrary users since no prior authentication is needed. 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.) in case the user has an active session on the same domain already.

Metrics

EPSS Probability

2.64%

83.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions	Update
Open-Xchange	Ox Guard	<= 2.4.2	Rev4

References

http://packetstormsecurity.com/files/138701/Open-Xchange-Guard-2.4.2-Cross-Site-Scripting.htmlExploit, Third Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/539395/100/0/threaded
http://www.securityfocus.com/bid/92920Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/40377/Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/138701/Open-Xchange-Guard-2.4.2-Cross-Site-Scripting.htmlExploit, Third Party Advisory, VDB Entry
http://www.securityfocus.com/archive/1/539395/100/0/threaded
http://www.securityfocus.com/bid/92920Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/40377/Exploit, Third Party Advisory, VDB Entry

Timeline

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

Frequently Asked Questions

What is CVE-2016-6851?

How severe is CVE-2016-6851?

Severity scoring for CVE-2016-6851 is pending analysis. The EPSS model estimates a 2.64% probability of exploitation in the next 30 days.

How do I fix CVE-2016-6851?

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.

Are you affected by CVE-2016-6851?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST