Tag: microsoft exchange
9 articles
Microsoft Exchange Flaw Exposes Mailboxes to Authenticated Attackers
A newly discovered flaw in Microsoft Exchange Server could put your mailboxes at risk, allowing authenticated attackers to elevate their privileges and gain unauthorized access across your network. Microsoft has urgently released a security update to patch this high-severity vulnerability, rated 8.8 on the CVSS scale.
NightEagle Exploits Legitimate Tools to Target Russian Firms
Kaspersky's Global Emergency Response Team has uncovered a sneaky tactic used by the NightEagle group to target Russian firms, exploiting legitimate tools like compromised VPN credentials and Cloudflare WARP to gain initial access. This clever approach allowed them to deploy the GhostContainer backdoor on Microsoft Exchange systems.
Russian Enterprises Targeted by Backdoor, Ransomware Attacks from Three Threat Groups
Russian enterprises are under attack by three threat groups, with hackers exploiting compromised credentials to breach corporate VPNs and deploy powerful malware like GhostContainer, a modular backdoor that gives attackers complete control over Microsoft Exchange Servers. This sneaky malware can run arbitrary code, manipulate files, and hide in plain sight, making it a formidable foe for even the most secure systems.
Unpatched Microsoft Exchange Servers Exposed to Hijack Attacks
Thousands of Microsoft Exchange servers remain vulnerable to a high-severity flaw, leaving 21,899 internet-facing systems open to hijack attacks that could give attackers control of every mailbox. This unpatched authentication-bypass vulnerability, CVE-2026-62911, was fixed by Microsoft in August, but many servers still haven't been updated.
Microsoft Ends Exchange 2016, 2019 Security Updates in October
Microsoft is ending security updates for Exchange Server 2016 and 2019 in October 2026, with no further extensions available, even for those currently in Period 2 of the Extended Security Update program. This marks the final cutoff for support, leaving organizations without updates after that date.
Hackers Disrupt Microsoft Exchange, Windows 11 at Pwn2Own Contest
Security researchers just scored big at Pwn2Own Berlin 2026, raking in $385,750 for exploiting 15 zero-day vulnerabilities in top tech targets like Microsoft Exchange and Windows 11. The contest, running from May 14-16, offers up to $1 million in prizes for hacking the latest enterprise technologies.
Microsoft Exchange Servers Targeted by Active CVE-2026-42897 Exploit
Microsoft warns of a high-severity vulnerability, CVE-2026-42897, in its Exchange Servers, allowing attackers to spoof network communications via a cleverly crafted email. This cross-site scripting flaw has been actively exploited, earning a concerning CVSS score of 8.1.
China-linked hackers exploit Microsoft Exchange in Azerbaijani energy firm attacks.
A group of China-linked hackers, known as FamousSparrow, launched a sustained cyberattack on an Azerbaijani oil and gas company, exploiting Microsoft Exchange vulnerabilities in a multi-wave intrusion that spanned three months. The attackers used the ProxyNotShell exploit to gain and maintain access to the victim's environment.
China-Linked Hackers Expose Wide-Ranging Espionage Campaign
Meet SHADOW-EARTH-053, a China-aligned espionage group that's been secretly lurking in the shadows since December 2024, using clever tactics like exploiting vulnerabilities and deploying web shells to gain persistent access to sensitive targets. Their sophisticated attacks have been linked to other notorious intrusion sets, revealing a vast and complex espionage campaign.