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CVE-2016-4843: Cybozu Mailwise can leak authentication cookies

CVE-2016-4843 · published 9 years ago

Summary

The Mailwise email system (versions before 5.4.0) can expose the cookies that keep users logged in, allowing a remote attacker to capture them. With those cookies, an attacker could impersonate users and access sensitive information. Update Mailwise to version 5.4.0 or later as soon as possible to stop the risk.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
cybozu	mailwise	5.0.0 5.0.1 5.0.4 5.0.5 5.0.6 5.1.0 5.1.1 5.1.2 5.1.4 5.2.0 5.2.1 5.3.0 2 more version ranges `cpe:2.3:a:cybozu:mailwise:5.0.0:::::::*`

Original advisory text

Cybozu Mailwise before 5.4.0 allows remote attackers to obtain sensitive cookie information.

References

http://jvn.jp/en/jp/JVN03052683/index.html Third Party Advisory VDB Entry
http://jvndb.jvn.jp/en/contents/2016/JVNDB-2016-000137.html VDB Entry
http://www.securityfocus.com/bid/92461 Third Party Advisory VDB Entry
https://support.cybozu.com/ja-jp/article/9654 Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker partial control (estimated)

Severity

6.5 Medium

Exploitation

2% chance of attack within 30 days

Type

CWE-200Information Exposure

Timeline

Published20 Apr 2017

Updated3 Nov 2026

First seen29 Sep 2026

Sources

CVE-2016-4843 · NVD

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