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Sign up for CERT alerts and also the CISA Vulnerability Summary of the Week has a lot of vuln info. https://us-cert.cisa.gov/ncas/bulletins
SANS Stormcast - https://isc.sans.edu/podcast.html - It's 5-10 minutes of daily updates
Microsoft Security Response Center blog - https://msrc-blog.microsoft.com/
Google Project Zero - https://googleprojectzero.blogspot.com/
Talos Vulnerabily info - https://talosintelligence.com/vulnerability_info
BleepingComputer - https://www.bleepingcomputer.com/news/security/
Threat post - https://threatpost.com/
Security Affairs - https://securityaffairs.co/wordpress/
Krebs on Security - https://krebsonsecurity.com/
Dark Reading - https://www.darkreading.com/
Google Security Blog - https://security.googleblog.com/
Schneier on Security - https://www.schneier.com/
The Hacker News - https://thehackernews.com/
All Infosec News - https://allinfosecnews.com/
Also sign up for any of your vendor's security alerts/updates or monitor their sites for updates.
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