{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4121","assignerOrgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","state":"PUBLISHED","assignerShortName":"Wordfence","dateReserved":"2026-03-13T13:31:45.845Z","datePublished":"2026-04-22T07:45:40.047Z","dateUpdated":"2026-04-23T13:46:58.669Z"},"containers":{"cna":{"providerMetadata":{"orgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","shortName":"Wordfence","dateUpdated":"2026-04-22T07:45:40.047Z"},"affected":[{"vendor":"ksolves","product":"Kcaptcha","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.0.1","versionType":"semver"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"The Kcaptcha plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 1.0.1. This is due to missing nonce validation in the plugin's settings page handler (admin/setting.php). The settings form does not include a wp_nonce_field() and the form processing code does not call wp_verify_nonce() or check_admin_referer() before saving settings to the database via $wpdb->update(). This makes it possible for unauthenticated attackers to modify the plugin's CAPTCHA settings (enabling or disabling CAPTCHA on login, registration, lost password, and comment forms) via a forged request, granted they can trick a site administrator into performing an action such as clicking a link."}],"title":"Kcaptcha <= 1.0.1 - Cross-Site Request Forgery to Settings Update","references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/a6c1c73b-76e3-4cb9-ad53-9d5d4e7519c9?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php#L12"},{"url":"https://plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php#L12"},{"url":"https://plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php#L30"},{"url":"https://plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php#L30"},{"url":"https://plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php#L47"},{"url":"https://plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php#L47"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-352 Cross-Site Request Forgery (CSRF)","cweId":"CWE-352","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","baseScore":4.3,"baseSeverity":"MEDIUM"}}],"credits":[{"lang":"en","type":"finder","value":"Muhammad Afnaan"}],"timeline":[{"time":"2026-04-21T19:07:38.000Z","lang":"en","value":"Disclosed"}]},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-23T13:46:48.672016Z","id":"CVE-2026-4121","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":"2026-04-23T13:46:58.669Z"}}]}}