CVE-2021-23126: 
Joomla vulnerability analysis and mitigation

A vulnerability was discovered in Joomla! versions 3.2.0 through 3.9.24 related to insecure randomness in the two-factor authentication (2FA) secret generation process. The issue was reported on January 12, 2021, and fixed on March 2, 2021, with the release of version 3.9.25. This vulnerability has been assigned CVE-2021-23126 (Joomla Security).

The vulnerability stems from the usage of the insecure rand() function within the process of generating the 2FA secret. The issue is rated with a CVSS score of 6.0 (AV:N/AC:L/Au:N/C:P/I:P/A:N), indicating a moderate severity level. Additionally, the implementation used an insufficient length for the 2FA secret according to RFC 4226, implementing only 10 bytes instead of the recommended 20 bytes (Rapid7).

The vulnerability could potentially compromise the security of two-factor authentication implementation in affected Joomla! installations, potentially leading to partial confidentiality and integrity breaches (Rapid7).

The vulnerability has been addressed in Joomla! version 3.9.25. Site administrators are advised to upgrade to this version or later to resolve the security issue. Additional details and context for existing sites can be found in the Joomla! documentation (Joomla Security).