Magento 1.9.2.3 is the new update for Magento 1 which includes Security Patch Bundle SUPEE-7405 and USPS Patch SUPEE-7616. New security patches can be downloaded from the official Magento download page and can be installed by official How to guide for an older security patch.

To know more about it, see the link below:
Magento Releases 1.9.2.3 Security Patches Update: SUPEE-7405 & SUPEE-7616

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