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CVE-2026-0561

MEDIUM 6.1 CVSS 3.1
Published
February 19, 2026
Last modified
June 17, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Description

The Shield Security plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'message' parameter in all versions up to, and including, 21.0.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected WordPress components

  • Shield Security – Smart Bot Blocking, Brute-Force Login Protection & File Scanning Plugin · wp-simple-firewall
    Confirmed match Active
    Up to and including 21.0.8
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • paultgoodchild Shield: Blocks Bots, Protects Users, and Prevents Security Breaches — Up to and including 21.0.8

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3439494%40wp-simple-firewall&new=3439494%40wp-simple-firewall&sfp_email=&sfph_mail=
  • research.cleantalk.org https://research.cleantalk.org/cve-2026-0561
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/cb49eb5f-c1ff-4440-8b53-c2515e65da27?source=cve
  • nvd.nist.gov Official NVD record