Help Net Security newsletters: Daily and weekly news, cybersecurity jobs, open source projects, breaking news – subscribe here!

Please turn on your JavaScript for this page to function normally.
Google AI
Google researchers uncover criminal zero-day exploit likely built with AI

Google’s threat intelligence researchers have linked a zero-day exploit to AI-assisted development by a criminal group. The exploit targeted a popular open-source …

Palo Alto Networks
State-sponsored hackers likely behind zero-day attacks on Palo Alto firewalls

Palo Alto Networks believes the in-the-wild exploitation of a zero-day vulnerability (CVE-2026-0300) in its firewalls is likely the work of state-sponsored threat actors. A …

danger
GopherWhisper APT group hides command and control traffic in Slack and Discord

Attackers continue to lean on everyday collaboration platforms to hide command and control traffic inside normal enterprise noise. A newly identified China-aligned APT group …

door
Iran-linked APT targets US critical sectors with new backdoors

An Iran-linked hacking group has been active inside the networks of several US organizations since early February, raising concerns that the activity could precede broader …

door
Singapore telcos breached in China-linked cyber espionage campaign

Singapore’s four major telecommunications companies were hit by a coordinated cyber espionage campaign last year, the country’s Cyber Security Agency (CSA) has revealed. …

Poland’s energy control systems were breached through exposed VPN access

On 29 December 2025, coordinated cyberattacks unfolded across Poland’s critical infrastructure, targeting energy and industrial organizations. The attackers struck numerous …

malware
Russian hackers are exploiting recently patched Microsoft Office vulnerability (CVE-2026-21509)

Russian state-sponsored hackers Fancy Bear (aka APT 28) are exploiting CVE-2026-21509, a Microsoft Office vulnerability for which Microsoft released an emergency fix last …

Notepad++
Notepad++ supply chain attack: Researchers reveal details, IoCs, targets

Rapid7 researchers have attributed the recent hijacking of the Notepad++ update mechanism to Lotus Blossom (aka Billbug), a Chinese state-sponsored group known for targeting …

WinRAR vulnerability still a go-to tool for hackers, Mandiant warns

State-sponsored hackers and financially motivated attackers continue leveraging a critical WinRAR vulnerability (CVE-2025-8088) that’s been fixed over half a year ago. …

energy
Poland repels data-wiping malware attack on energy systems

Suspected Russian cyber attackers tried to take down parts of Poland’s energy infrastructure with new data-wiping malware – and failed. According to information shared …

Cisco
Cisco fixes AsyncOS vulnerability exploited in zero-day attacks (CVE-2025-20393)

Cisco has finally shipped security updates for its Email Security Gateway and Secure Email and Web Manager devices, which fix CVE-2025-20393, a vulnerability in the …

hand
Group Policy abuse reveals China-aligned espionage group targeting governments

ESET Research has identified a previously undocumented China-aligned advanced persistent threat group that uses Windows Group Policy to deploy malware and move through victim …

Don't miss

Cybersecurity news
Daily newsletter sent Monday-Friday
Weekly newsletter sent on Mondays
Editor's choice newsletter sent twice a month
Periodical newsletter released for important security events and breaking news
Weekly newsletter listing new cybersecurity job positions
Monthly newsletter focusing on open source cybersecurity tools