Ethereum Classic warns of unauthorized Core-Geth security update

Ethereum Classic reported a social engineering incident involving an unverified v1.13.0 release of the Core-Geth client, which was falsely promoted as a security update on September 14. Some mining pools briefly switched to this version before reverting to the official etclabscore/core-geth v1.12.23. The unauthorized version contained modifications to chain selection and node discovery that posed a risk of network splitting, though no block loss, chain reorganization, or financial loss occurred.