NEW: Telstra was repeatedly warned by government and experts about the type of vulnerability that brought down its network. This morning, Telstra CEO Vicki Brady said this risk was "well-known" but didn't confirm if it had a back-up system or plan for this type of problem. https://www.abc.net.au/news/2026-07-10/telstra-warned-about-vulnerability-before-national-outage/106896906