September 2025 CVE Landscape
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ToolShell Exploit: Critical SharePoint Zero
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XE Hacker Group Exploits VeraCore Zero
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ToolShell: Details of CVEs affecting SharePoint servers
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Microsoft fixes exploited WordPad, Skype for Business zero-days (CVE-2023-36563, CVE-2023-41763)
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⚡ Weekly Recap: Chrome 0-Day, Router Hijacks, Coder Supply Chain Attack and More
Weekly recap: actively exploited Chrome V8 zero-day, MikroTik RouterOS zero-day chain, Magento StyleSmuggler backdoor, and critical N-able N-central flaws.
Google patched an actively exploited Chrome V8 type confusion zero-day, CVE-2026-85046 (CVSS 8.8), the sixth exploited Chrome zero-day of 2026. CERT Polska warned of the MikroTrick exploit chain (CVE-2026-67276 and CVE-2026-86060, CVSS 9.2) giving unauthenticated full control of MikroTik RouterOS devices via SSH, observed since September 2. Sansec disclosed the StyleSmuggler Magento/Adobe Commerce zero-day used since September 4 to inject a Rust backdoor into online stores, while N-able patched three critical N-central flaws (CVE-2026-86206, CVE-2026-86207, and CVE-2026-86218, CVSS 10.0) with Huntress observing likely exploitation. Elastic and Morphisec also detailed RevStealer, an information stealer spread via game cheats and a fake Claude Desktop app.
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2026-004: Critical Vulnerability in SharePoint Exploited
CVE-2026-20963 (CVSS 9.8), an unauthenticated RCE in on-prem SharePoint, was added to CISA's KEV on 18 March 2026 and is actively exploited.
CERT-EU warns about CVE-2026-20963, a CVSS 9.8 unauthenticated remote code execution flaw in SharePoint caused by deserialisation of untrusted data, affecting SharePoint Server Subscription Edition, 2019, and Enterprise Server 2016. Microsoft raised the CVSS score on 17 March 2026 and the flaw entered CISA's Known Exploited Vulnerabilities catalogue on 18 March 2026. Three additional SharePoint RCE flaws (CVE-2026-26106, CVE-2026-26113, CVE-2026-26114) were fixed in the March 2026 release. CERT-EU urges immediate patching of internet-facing servers plus AMSI Full Mode, EDR deployment, ASP.NET machine key rotation, and compromise assessments.
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Two New Windows Zero-Days Exploited in the Wild — One Affects Every Version Ever Shipped
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Hackers Exploit SharePoint Zero-Day Since July 7 to Steal Keys, Maintain Persistent Access
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Critical Unpatched SharePoint Zero-Day Actively Exploited, Breaches 75+ Company Servers
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Microsoft Fixes Five Zero
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Microsoft updated MSERT to detect web shells used in attacks against Microsoft Exchange installs
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Microsoft plugs 56 vulns, including Office flaw exploited in attacks
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