GTA 6 footage from the Rockstar breach, via @vxunderground — confirmed real
@vxunderground flagged the Rockstar breach on Sept 18, 2022. Rockstar confirmed a network intrusion the next day.
Leaked on 18 September 2022

On Sept 18, 2022, @vxunderground posted that Grand Theft Auto 6 material had surfaced online from an alleged Rockstar Games breach, and that forum users initially treated it as a hoax.
On Sept 19, Rockstar confirmed that a network intrusion had exposed early development footage. TechCrunch, The Verge and Ars Technica all reported the confirmation that day.
Confirmed. Leakly does not link the forum thread or the footage.