Medium severity · published Sep 18, 2026
CVE-2026-90977
Clean Login < 1.19 - Unauthenticated CAPTCHA Bypass via Empty Session Comparison
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CL
Clean Login ·
before 1.19 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90977
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90977
wpscan.com
https://wpscan.com/vulnerability/368db83e-ed7b-4f67-99db-2e5f1c01568e/
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CVE-2022-4838
Clean Login < 1.13.7 - Contributor+ Stored XSS via Shortcode
5.3
CVE-2026-90976
Clean Login < 1.19 - Unauthenticated Account Creation with Registration Disabled