CVE-2025-9824: 
PHP vulnerability analysis and mitigation

CVE-2025-9824 is a timing-based user enumeration vulnerability discovered in Mautic software affecting versions 4.4.0-4.4.16, 5.0.0-alpha to 5.2.7, and 6.0.0-alpha to 6.0.4. The vulnerability was disclosed on September 3, 2025, and allows attackers to determine valid usernames by analyzing login response times (Mautic Advisory).

The vulnerability stems from inconsistent response timing during login attempts. When a valid username is provided, the system performs password hashing, while no hashing occurs for invalid usernames, creating an observable timing difference. The vulnerability has been assigned a CVSS v3.1 score of 5.9 (Medium) with the vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating network accessibility with high attack complexity (Mautic Advisory).

The vulnerability enables attackers to enumerate valid user accounts by measuring login response times. Once valid usernames are identified, attackers could potentially launch targeted brute force attacks against these accounts (Mautic Advisory).

The vulnerability has been patched in Mautic versions 4.4.17, 5.2.8, and 6.0.5. The fix implements a TimingSafeFormLoginAuthenticator that performs dummy password hash verification for non-existent users, ensuring consistent response timing regardless of username validity. No workarounds are available, and users are advised to upgrade to the patched versions (Mautic Advisory).