CVE-2026-90977 Clean Login < 1.19 - Unauthenticated CAPTCHA Bypass via Empty Session Comparison
Unauthenticated attackers can bypass CAPTCHA verification on the registration form to create accounts without solving it.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90977?
CVE-2026-90977 is a medium-severity vulnerability in Unknown Clean Login, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-697
Which versions are affected by CVE-2026-90977?
How do I fix CVE-2026-90977?
No fix has been published for CVE-2026-90977 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-90977 being exploited?
There is no known exploitation of CVE-2026-90977 in the wild and no public exploit code.
Sources
Also known as GHSA-whxq-7ph8-rv4q.