CVE-2026-90977 PUBLISHED

Clean Login < 1.19 - Unauthenticated CAPTCHA Bypass via Empty Session Comparison

Assigner: WPScan
Reserved: 14.09.2026 Published: 18.09.2026 Updated: 18.09.2026

The Clean Login WordPress plugin before 1.19 does not verify its registration CAPTCHA when the stored session value is empty, allowing unauthenticated users to bypass the anti-automation control on the registration form and create accounts without solving it.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS Score: 5.3

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

CVSS 3.1

Product Status

Vendor	Unknown
Product	Clean Login
Versions	Default: unaffected affected from 0 to 1.19 (excl.)

Credits

Arthur Morgan finder
WPScan coordinator

References

https://wpscan.com/vulnerability/368db83e-ed7b-4f67-99db-2e5f1c01568e/

Problem Types

CWE-697 Incorrect Comparison CWE