CVE-2025-54336 Auth bypass in n/a
An attacker can bypass admin authentication in Plesk by exploiting a loose comparison vulnerability, gaining unauthorized access to the control panel.
- 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-2025-54336?
CVE-2025-54336 is a critical authentication bypass vulnerability in n/a, published on 19 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Plesk Obsidian 18.0.70, _isAdminPasswordValid uses an == comparison. Thus, if the correct password is "0e" followed by any digit string, then an attacker can login with any other string that evaluates to 0.0 (such as the 0e0 string). This occurs in admin/plib/LoginManager.php.
Weakness: CWE-697
Which versions are affected by CVE-2025-54336?
How do I fix CVE-2025-54336?
No fix has been published for CVE-2025-54336 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-2025-54336 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-54336 exists.
Sources
Also known as GHSA-8h52-4p7x-v4mc.