CVE-2026-18356 Limit Login Attempts Reloaded < 3.3.5 - Username Denylist Bypass via Case Variant and Account Email
Attackers can bypass login restrictions by using case variants or email addresses, allowing blocked accounts to authenticate.
- 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-2026-18356?
CVE-2026-18356 is a low-severity authentication bypass vulnerability in Unknown Limit Login Attempts Security, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Limit Login Attempts Reloaded WordPress plugin before 3.3.5 does not compare logins against its username denylist case-insensitively and does not account for the account's email address, allowing an account an administrator intended to block from logging in to authenticate anyway.
Weakness: CWE-184
Which versions are affected by CVE-2026-18356?
How do I fix CVE-2026-18356?
No fix has been published for CVE-2026-18356 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-18356 being exploited?
There is no known exploitation of CVE-2026-18356 in the wild and no public exploit code.
Sources
Also known as GHSA-pr5g-gw8g-vfpm.