WordPress plugin "Nofollow Links" vulnerable to cross-site scripting


The WordPress plugin "Nofollow Links" contains a cross-site scripting (CWE-79) vulnerability in nofollow-links.php.

Gen Sato of TRADE WORKS Co.,Ltd. Security Dept. 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 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

Nofollow Links
  • Nofollow Links version 1.0.10 and earlier


An arbitrary script may be executed on the web browser of a user who is logged on as an administrator.

[Update the plugin]
Update the plugin according to the information provided by the developer.
Vendor Information

Nofollow Links
CWE (What is CWE?)

  1. Cross-site Scripting(CWE-79) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2016-4833

  1. JVN : JVN#13582657
  2. National Vulnerability Database (NVD) : CVE-2016-4833
Revision History

  • [2016/07/20]
      Web page was published
      References : Content was added