Microsoft introduced an Outlook DMARC email rejection rule, bouncing messages lacking DMARC records with the 550 5.7.1 authentication error.

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The post Outlook DMARC Email Rejection Policy Bounces Unsigned Messages appeared first on Daily CyberSecurity.

Kerio Connect vulnerability CVE-2026-112353, a stored XSS flaw via SVG attachments, is exploited in the wild to steal mailboxes. Update to 10.0.8p2.

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The post Kerio Connect Vulnerability CVE-2026-112353 Exploited in the Wild to Steal Mailboxes appeared first on Daily CyberSecurity.

A Roundcube security update fixes 20 flaws, including IMAP command injection and header injection. Upgrade to 1.6.20 or 1.7.5 now.

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The post Roundcube 1.6.20 and 1.7.5 Fix 20 Security Flaws, Including IMAP Command Injection appeared first on Daily CyberSecurity.

A Power BI phishing campaign uses Microsoft's real domain to install rogue ScreenConnect clients. Learn how it works and how to block it.

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The post Phishing Campaign Abuses Microsoft Power BI to Install Rogue ScreenConnect Clients appeared first on Daily CyberSecurity.

Twenty CRM vulnerability CVE-2026-105763 (CVSS 9.6) enables plaintext password disclosure of IMAP and SMTP accounts. Upgrade to 2.7.0.

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The post Twenty CRM Flaw CVE-2026-105763 Exposes Plaintext Email Passwords to Any Workspace Member appeared first on Daily CyberSecurity.

Zimbra CVE-2026-73570 lets one crafted email run code. Microsoft details the Zimbra command injection attacks: web shells, root access, and key theft.

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The post Microsoft Tracks Zimbra CVE-2026-73570 Attacks That Steal Mail and Auth Keys appeared first on Daily CyberSecurity.

SVG phishing attacks jumped in August 2026. Symantec explains how SVG smuggling hides fake logins and malware inside image files, and how to stop it.

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The post SVG Phishing Attacks Return in August as Symantec Logs 222,000 Detections appeared first on Daily CyberSecurity.

Discover why GitHub blocks Outlook and Hotmail for new account registrations. Learn about the persistent fraud and abuse driving this Microsoft email ban.

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The post GitHub Blocks New Outlook and Hotmail Sign-Ups appeared first on Daily CyberSecurity.