What is CVE-2026-90977?

CVE-2026-90977 is a medium-severity vulnerability in Clean Login, classified under Incorrect Comparison. CVSS score: 5.3/10. Published 2026-09-18.

How severe is CVE-2026-90977?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Clean Login

CVE-2026-90977

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.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Unknown Clean Login

Weakness classification (CWE)

CWE-697 — Incorrect Comparison

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-90977?: CVE-2026-90977 is a medium-severity vulnerability in Clean Login, classified under Incorrect Comparison. CVSS score: 5.3/10. Published 2026-09-18.
How severe is CVE-2026-90977?: Medium severity. CVSS v3 base score is 5.3 out of 10.