baserCMS plugin Uploader vulnerable to cross-site request forgery


baserCMS provided by baserCMS User Group is an opensource content management system. baserCMS and bundled plugin Uploader contain a cross-site request forgery vulnerability.

Masamu Asato of National Institute of Technology, Okinawa College reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 5.4 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
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

baserCMS Users Community
  • baserCMS version 3.0.10 and earlier
  • baserCMS plugin Uploader version 3.0.10 and earlier


When "Uploader" plugin is enabled and a logged-in user in Administrative group accesses a malicious URL, the user may be forced to conduct unintended operations on the baserCMS server such as deletion of a file or alteration of access restriction configuration.

[Update the Software]
Update the software according to the information provided by the developer.
An old version of "Uploader" plugin is provided at the baser market. The developer states that applying baserCMS update overwrites the old version of "Uploader" plugin.
Vendor Information

baserCMS Users Community
CWE (What is CWE?)

  1. Cross-Site Request Forgery(CWE-352) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2016-4887

  1. JVN : JVN#92765814
  2. National Vulnerability Database (NVD) : CVE-2016-4887
Revision History

  • [2016/09/29]
      Web page was published
      References : Content was added