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Weekly Cybersecurity Report | Week 23, 2026
Information security updates and events from the past week
1. The “HTTP/2 Bomb” Denial-of-Service Vulnerability
One of the most technically significant events this week was the discovery of a new DoS technique dubbed the “HTTP/2 Bomb.”
- The Threat: Researchers identified a way to exploit header compression in the HTTP/2 protocol to overwhelm web servers.
- Impacted Systems: Major web servers and implementations, including NGINX, Apache HTTPD, Microsoft IIS, Envoy, and Cloudflare Pingora, were found to be vulnerable.
- Risk: A single malicious connection can potentially exhaust server resources, leading to significant service disruptions. Security teams are advised to monitor traffic patterns and apply updates from their respective server vendors.
2. Actively Exploited Android Zero-Day (CVE-2025-48595)
Google’s June 2026 Android security update arrived this week, addressing 124 vulnerabilities, most notably a critical Zero-Click Zero-Day.
- The Flaw: Identified as CVE-2025-48595, this is an elevation-of-privilege issue within the Android Framework.
- Severity: Google confirmed that the flaw is under limited, targeted exploitation in the wild.
- Action Required: Users and organizations are urged to prioritize the June 2026 security patch for all Android devices, particularly those used in corporate environments.
3. Operation “FlutterBridge”: macOS Malvertising Campaign
Palo Alto Networks Unit 42 reported a sophisticated malvertising campaign targeting macOS users.
- The Method: Attackers used Google Ads, and “fake software” download pages to trick users into installing a backdoor known as FlutterShell, which is built on the Flutter framework.
- Once installed, the backdoor provides attackers with persistent remote access to the victim’s machine. Users are advised to exercise caution when downloading software via search engine advertisements.
4. Magento E-commerce Exploitation (CVE-2026-45247)
CISA added a critical vulnerability in the Mirasvit Full Page Cache Warmer for Magento 2 to its “Known Exploited Vulnerabilities” (KEV) catalog.
- The Flaw: A PHP object injection vulnerability stemming from unsafe deserialization allows attackers to achieve Remote Code Execution (RCE).
- Remediation: Systems running versions older than 1.11.12 must be patched immediately. Administrators should also scan their servers for suspicious cookies and unauthorized web shells.
5. Dashlane Password Manager Breach
The password provider Dashlane disclosed a security incident involving a brute-force attack on a small number of accounts.
- Status: Dashlane has notified the affected users. This incident serves as a reminder to always utilize multi-factor authentication (MFA) and strong, unique master passwords to add a layer of defense even if service-side account access is attempted.
- The Impact: Attackers managed to access and download encrypted vault data belonging to fewer than 20 personal plan users.
6. Continued Fallout from the Charter Communications Leak
While the initial breach occurred shortly before this period, the fallout continued into this week as the ShinyHunters extortion group published the data of approximately 42 million Charter Communications customers. The breach, which originated from a vishing (voice phishing) attack, remains a primary case study for the dangers of social engineering against corporate employees.
The cybersecurity attacks highlighted in this report aren’t just incidents, they’re blueprints of the adversary’s arsenal. To protect your business you need the right partner. CyberOne is here to help! Check out our services.
