{"id":"CVE-2026-0561","aliases":["EUVD-2026-8229","GHSA-wpqj-w3wq-pqjv"],"status":"published","title":"Shield Security \u003c= 21.0.8 - Unauthenticated Reflected Cross-Site Scripting via 'message' Parameter","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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00655,"percentile":0.51693,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-02-19T04:36:23Z","modified":"2026-06-17T10:10:56Z","exploits":[{"source":"nuclei","id":"CVE-2026-0561","title":"Shield Security \u003c= 21.0.8 - Unauthenticated Reflected XSS","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-0561.yaml"}],"products":[{"vendor":"paultgoodchild","product":"shield: blocks bots, protects users, and prevents security breaches"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/cb49eb5f-c1ff-4440-8b53-c2515e65da27?source=cve"},{"url":"https://research.cleantalk.org/cve-2026-0561"},{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026old=3439494%40wp-simple-firewall\u0026new=3439494%40wp-simple-firewall\u0026sfp_email=\u0026sfph_mail="},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-0561"},{"url":"https://github.com/advisories/GHSA-wpqj-w3wq-pqjv"}],"sources":{"cve":[{"id":"CVE-2026-0561","title":"Shield Security \u003c= 21.0.8 - Unauthenticated Reflected Cross-Site Scripting via 'message' Parameter","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.","status":"published","published":"2026-02-19T04:36:23.952Z","modified":"2026-04-08T17:23:26.711Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:20:13.587351Z"}],"euvd":[{"id":"EUVD-2026-8229","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.","status":"published","published":"2026-02-19T04:36:23Z","modified":"2026-04-08T17:23:26Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:40.44402Z"}],"ghsa":[{"id":"GHSA-wpqj-w3wq-pqjv","title":"The Shield Security plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ...","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.","status":"published","published":"2026-02-19T18:31:50Z","modified":"2026-02-19T18:32:02Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:06:16.091884Z"}],"nvd":[{"id":"CVE-2026-0561","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.","status":"published","published":"2026-02-19T07:17:41.65Z","modified":"2026-06-17T10:10:56.937Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:06.274729Z"}]}}