{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-0561", "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "state": "PUBLISHED", "assignerShortName": "Wordfence", "dateReserved": "2026-01-01T22:13:21.759Z", "datePublished": "2026-02-19T04:36:23.952Z", "dateUpdated": "2026-04-08T17:23:26.711Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "shortName": "Wordfence", "dateUpdated": "2026-04-08T17:23:26.711Z"}, "affected": [{"vendor": "paultgoodchild", "product": "Shield: Blocks Bots, Protects Users, and Prevents Security Breaches", "versions": [{"version": "0", "status": "affected", "lessThanOrEqual": "21.0.8", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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."}], "title": "Shield Security <= 21.0.8 - Unauthenticated Reflected Cross-Site Scripting via 'message' Parameter", "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=&sfph_mail=&reponame=&old=3439494%40wp-simple-firewall&new=3439494%40wp-simple-firewall&sfp_email=&sfph_mail="}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "cweId": "CWE-79", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM"}}], "credits": [{"lang": "en", "type": "finder", "value": "Dmitrii Ignatyev"}], "timeline": [{"time": "2025-12-25T00:00:00.000Z", "lang": "en", "value": "Discovered"}, {"time": "2026-02-18T16:17:44.000Z", "lang": "en", "value": "Disclosed"}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-19T21:14:47.532106Z", "id": "CVE-2026-0561", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-19T21:14:59.387Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "El plugin Shield Security para WordPress es vulnerable a Cross-Site Scripting Reflejado a trav\u00e9s del par\u00e1metro 'message' en todas las versiones hasta la 21.0.8, inclusive, debido a una sanitizaci\u00f3n de entrada y un escape de salida insuficientes. Esto permite a atacantes no autenticados inyectar scripts web arbitrarios en p\u00e1ginas que se ejecutan si logran enga\u00f1ar a un usuario para que realice una acci\u00f3n como hacer clic en un enlace."}], "id": "CVE-2026-0561", "lastModified": "2026-04-15T00:35:42.020", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "security@wordfence.com", "type": "Secondary"}]}, "published": "2026-02-19T07:17:41.650", "references": [{"source": "security@wordfence.com", "url": "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="}, {"source": "security@wordfence.com", "url": "https://research.cleantalk.org/cve-2026-0561"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/cb49eb5f-c1ff-4440-8b53-c2515e65da27?source=cve"}], "sourceIdentifier": "security@wordfence.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security@wordfence.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,21.0.8]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Shield: Blocks Bots, Protects Users, and Prevents Security Breaches", "source": "cna", "vendor": "paultgoodchild"}, "product": "shield:_blocks_bots,_protects_users,_and_prevents_security_breaches", "vendor": "paultgoodchild"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": null}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "wordpress", "vendor": "wordpress"}], "analysis": {"en": {"generated_at": "2026-04-15T18:10:17.295141+00:00", "value": {"mitigation_remediation": ["Upgrade the Shield Security plugin to version 21.0.9 or later where the 'message' parameter is properly sanitized and output escaped.", "If an upgrade is not immediately available, disable or remove any functionality that exposes the 'message' parameter to public requests, such as turning off related processing scripts or setting the plugin to ignore this parameter.", "Deploy a web application firewall or content\u2011security\u2011policy headers on the WordPress site to curb the execution of unexpected scripts and reduce the window of opportunity for exploitation."], "summary": {"action": "Apply Patch", "impact": "Unauthenticated Reflected Cross\u2011Site Scripting allowing arbitrary script execution in affected WordPress sites"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all releases of Shield Security for WordPress up to and including version 21.0.8, issued by paultgoodchild. Any WordPress site installing the plugin in these or earlier versions is potentially exposed.", "description_and_impact": "The Shield Security plugin for WordPress is vulnerable to Reflected Cross\u2011Site Scripting through the 'message' parameter. Because the plugin does not sanitize or escape this input, an attacker can embed malicious scripts that execute when a victim visits a crafted URL. The impact is the ability to run arbitrary client\u2011side code in the victim\u2019s browser, enabling session hijacking, cookie theft, or the execution of phishing vectors. The weakness is a classic input validation flaw (CWE\u201179).", "risk_and_exploitability": "The CVSS score of 6.1 classifies this as moderate\u2011risk. The EPSS score of less than 1% indicates a low but non\u2011zero exploitation probability. The vulnerability is unauthenticated and requires only that a victim click a crafted link, which makes it easy to deploy. It is not currently listed in the CISA KEV catalog. To exploit, an attacker needs to host a URL that includes an injected payload in the 'message' parameter and convince a user to click it, which will lead to script execution in the user\u2019s browser. This can be used to compromise user accounts or deface the site."}}}}, "created": "2026-02-19T10:06:53.941056+00:00", "updated": "2026-04-15T18:15:10.844750+00:00", "vendors": ["paultgoodchild", "paultgoodchild$PRODUCT$shield:_blocks_bots,_protects_users,_and_prevents_security_breaches", "wordpress", "wordpress$PRODUCT$wordpress"]}