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Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.
Operational focus: Check supported builds, update installation, restart state, and the current running version.
Read the current source record
Email threat landscape: Q2 2026 trends and insights
In the second quarter of 2026, the continuing effects of Microsoft’s disruption of the Tycoon2FA phishing platform contributed to sustained…
Operational focus: Prioritize domain, federation, collaboration, and internet-facing servers before normal endpoint queues.
Real world incident response: Microsoft and AXA XL strengthen cyber resilience
Our collaboration with AXA XL brings Microsoft Incident Response services directly to cyber insurance policyholders, helping organizations coordinate technical, business,…
Operational focus: Review privileged access and endpoint telemetry for signs of abuse before and after patching.
Microsoft at Black Hat USA 2026: Defending trust in the age of AI and supply chain attacks
Join Microsoft Security at Black Hat USA 2026 for supply chain research, hands-on security experiences, expert conversations, and our reception.…
Operational focus: Check supported builds, update installation, restart state, and the current running version.
CVE-2026-57990: Files or directories accessible to external parties in Microsoft Edge (Chromium-based) allows…
Files or directories accessible to external parties in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a…
Operational focus: Prioritize domain, federation, collaboration, and internet-facing servers before normal endpoint queues.
What teams should do next
Use the items above as a review queue, not as an automatic statement that every environment is vulnerable. Match each product or service against a current asset inventory, confirm the installed version, and identify whether an attacker can reach the affected path. CISA KEV entries deserve special attention because their inclusion is based on evidence of exploitation in the wild.
- Match Microsoft and CISA records to Windows builds and server products in inventory.
- Prioritize identity, SharePoint, Exchange, remote access, and domain-privileged systems.
- Test monthly updates, install promptly, and validate reboot or service restart completion.
- Review EDR health, tamper protection, authentication logs, and privileged group changes.
- Give every patch exception a business owner, mitigation, and expiry date.
References used in this briefing
- CISA Known Exploited Vulnerabilities: CVE-2026-50522: Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
- NIST NVD and Microsoft: CVE-2026-57092: Windows VMSwitch use-after-free privilege escalation
- GitHub Advisory Database: Shescape: Shell injection via unescaped parentheses on Windows with CMD
- NIST National Vulnerability Database: CVE-2026-57989: Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to…
- Microsoft Security Blog: Email threat landscape: Q2 2026 trends and insights
- Microsoft Security Blog: Real world incident response: Microsoft and AXA XL strengthen cyber resilience
- Microsoft Security Blog: Microsoft at Black Hat USA 2026: Defending trust in the age of AI and supply chain attacks
- NIST National Vulnerability Database: CVE-2026-57990: Files or directories accessible to external parties in Microsoft Edge (Chromium-based) allows…
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