Kcaptcha <= 1.0.1 - Cross-Site Request Forgery to Settings Update

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-4121
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 09:16:23 UTC
Updated2026-04-22 09:16:23 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Problem Types: CWE-352 | CWE-352 CWE-352 Cross-Site Request Forgery (CSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ksolves Kcaptcha affected 1.0.1 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/a6c1c73b-76e3-4cb9-ad53-9d5d4... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Muhammad Afnaan (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-21T19:07:38.000ZDisclosed
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