Cybozu Office session management vulnerability


Cybozu Office is a groupware. Cybozu Office contains a vulnerability in session management.

Ooi Keita reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V2 Severity:
Base Metrics 4.0 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

Cybozu, Inc.
  • Cybozu Office 9.1.0 and earlier


A third-party that obtains the URL for a login may impersonate a user and access the product. As a result information may be altered or disclosed.

[Update the software]
Update to the latest version according to the information provided by the developer.
Vendor Information

Cybozu, Inc.
CWE (What is CWE?)

  1. Improper Authentication(CWE-287) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2013-3656

  1. JVN : JVN#19491840
  2. National Vulnerability Database (NVD) : CVE-2013-3656
Revision History

  • [2013/07/16]
      Web page was published
      References : Content was added