Observable Response Discrepancy in Mautic - CVE-2025-9824
Published: May 25, 2026
Vulnerability identifier: #VU132237
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-9824
CWE-ID: CWE-204
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to enumerate valid usernames.
The vulnerability exists due to observable response discrepancy in the form login authenticator when handling login requests. A remote attacker can measure login response times to enumerate valid usernames.
This timing difference occurs because password hashing is performed for existing usernames but not for non-existent usernames.
Affected software
Mautic
How to mitigate CVE-2025-9824
Install security update from vendor's website.
Mautic - addressed in versions 4.4.18, 5.2.8, 6.0.5