CVE-2025-9824 User Enumeration via Response Timing
Attackers can enumerate valid usernames by analyzing login response timing differences, facilitating subsequent brute-force attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-9824?
CVE-2025-9824 is a medium-severity vulnerability in Mautic, published on 3 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ImpactThe attacker can validate if a user exists by checking the time login returns. This timing difference can be used to enumerate valid usernames, after which an attacker could attempt brute force attacks.
PatchesThis vulnerability has been patched, implementing a timing-safe form login authenticator that ensures consistent response times regardless of whether a user exists or not.
Technical DetailsThe vulnerability was caused by different response times when:
* A valid username was provided (password hashing occurred) * An invalid username was provided (no password hashing occurred)
The fix introduces a TimingSafeFormLoginAuthenticator that performs a dummy password hash verification even for non-existent users, ensuring consistent timing.
WorkaroundsNo workarounds are available. Users should upgrade to the patched version.
References * https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/03-Identity_Management_Testing/04-Testing_for_Account_Enumeration_and_Guessable_User_Account
Weakness: CWE-204
Which versions are affected by CVE-2025-9824?
6 open source packages ship an affected version, including mautic/core.
| Package | Affected | Fixed in |
|---|---|---|
mautic/core Packagist | From 4.4.0 | 4.4.17 |
mautic/core Packagist | From 4.4.0 | 4.4.17 |
mautic/core Packagist | From 5.0.0-alpha | 5.2.8 |
mautic/core Packagist | From 5.0.0-alpha | 5.2.8 |
mautic/core Packagist | From 6.0.0-alpha | 6.0.5 |
mautic/core Packagist | From 6.0.0-alpha | 6.0.5 |
How do I fix CVE-2025-9824?
Upgrade mautic/core to a fixed version for your release line: 4.4.17, 5.2.8 or 6.0.5.
Is CVE-2025-9824 being exploited?
There is no known exploitation of CVE-2025-9824 in the wild and no public exploit code.
Sources
Also known as GHSA-3ggv-qwcp-j6xg.