CVE-2026-90977: CWE-697 Incorrect Comparison in Clean Login
CVE-2026-90977 is a vulnerability in the Clean Login WordPress plugin versions before 1.19. The plugin fails to verify the registration CAPTCHA when the stored session value is empty, enabling unauthenticated users to bypass the CAPTCHA anti-automation control and create accounts without solving it.
AI Analysis
Technical Summary
The Clean Login WordPress plugin prior to version 1.19 contains an incorrect comparison vulnerability (CWE-697) where the registration CAPTCHA verification is skipped if the stored session value is empty. This flaw allows unauthenticated attackers to bypass the CAPTCHA protection on the registration form and create accounts without completing the CAPTCHA challenge.
Potential Impact
An attacker can create accounts on the affected WordPress site without solving the CAPTCHA, potentially facilitating automated account creation or spam. The confidentiality, integrity, and availability impacts are limited as per the CVSS vector, with only low confidentiality impact and no impact on integrity or availability.
Mitigation Recommendations
Upgrade the Clean Login plugin to version 1.19 or later where this vulnerability is fixed. Since no official patch link is provided, users should verify the availability of the fix from the plugin vendor or official WordPress plugin repository. Until patched, consider disabling the registration feature or adding additional anti-automation controls.
CVE-2026-90977: CWE-697 Incorrect Comparison in Clean Login
Description
CVE-2026-90977 is a vulnerability in the Clean Login WordPress plugin versions before 1.19. The plugin fails to verify the registration CAPTCHA when the stored session value is empty, enabling unauthenticated users to bypass the CAPTCHA anti-automation control and create accounts without solving it.
CVSS v3.1
Score 5.3medium
Affected software
Clean Login
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Clean Login WordPress plugin prior to version 1.19 contains an incorrect comparison vulnerability (CWE-697) where the registration CAPTCHA verification is skipped if the stored session value is empty. This flaw allows unauthenticated attackers to bypass the CAPTCHA protection on the registration form and create accounts without completing the CAPTCHA challenge.
Potential Impact
An attacker can create accounts on the affected WordPress site without solving the CAPTCHA, potentially facilitating automated account creation or spam. The confidentiality, integrity, and availability impacts are limited as per the CVSS vector, with only low confidentiality impact and no impact on integrity or availability.
Mitigation Recommendations
Upgrade the Clean Login plugin to version 1.19 or later where this vulnerability is fixed. Since no official patch link is provided, users should verify the availability of the fix from the plugin vendor or official WordPress plugin repository. Until patched, consider disabling the registration feature or adding additional anti-automation controls.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-14T13:40:30.252Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aacde7455bf5e2cf5a03563
Added to database: 09/18/2026, 06:47:16 UTC
Last enriched: 09/18/2026, 07:01:29 UTC
Last updated: 09/18/2026, 16:33:11 UTC
Views: 24
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