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1 vulnerability by ksolves

CVE-2026-4121 (GCVE-0-2026-4121)

Vulnerability from cvelistv5 – Published: 2026-04-22 07:45 – Updated: 2026-04-22 07:45
VLAI?
Title
Kcaptcha <= 1.0.1 - Cross-Site Request Forgery to Settings Update
Summary
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.
Severity ?
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CWE
  • CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
Impacted products
Vendor Product Version
ksolves Kcaptcha Affected: 0 , ≤ 1.0.1 (semver)
Create a notification for this product.
Credits
Muhammad Afnaan
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Kcaptcha",
          "vendor": "ksolves",
          "versions": [
            {
              "lessThanOrEqual": "1.0.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Muhammad Afnaan"
        }
      ],
      "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\u0027s 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-\u003eupdate(). This makes it possible for unauthenticated attackers to modify the plugin\u0027s 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-352",
              "description": "CWE-352 Cross-Site Request Forgery (CSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-22T07:45:40.047Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "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"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-04-21T19:07:38.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Kcaptcha \u003c= 1.0.1 - Cross-Site Request Forgery to Settings Update"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-4121",
    "datePublished": "2026-04-22T07:45:40.047Z",
    "dateReserved": "2026-03-13T13:31:45.845Z",
    "dateUpdated": "2026-04-22T07:45:40.047Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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