Active Exploitation Hits Microsoft CVE-2026-56164
Microsoft's July 2026 Patch Tuesday fixes over 100 vulnerabilities across its product line, and CVE-2026-56164 is already being exploited in the wild.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 2 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-56164 as exploited in the wild.
CERT-FR published an advisory summarizing Microsoft's monthly security update, covering more than 100 CVEs affecting a broad swath of the Microsoft ecosystem — Exchange Server, SharePoint, SQL Server, Visual Studio, .NET/OData libraries, Configuration Manager, Copilot, Defender for Endpoint, PC Manager, Surface devices, and even Age of Empires II. The flaws span remote code execution, privilege escalation, denial of service, information disclosure, and security-feature bypass classes.
Of particular note, Microsoft confirms that CVE-2026-56164 is being actively exploited in the wild, elevating the urgency of patch deployment for affected products beyond the routine cadence of a standard Patch Tuesday. CERT-FR's advisory does not provide technical details on the exploitation vector or affected component specifics for this CVE beyond confirming in-the-wild activity, and directs administrators to Microsoft's own security bulletins for patch guidance and CVSS scoring.
Given the scale of affected products — including internet-facing infrastructure such as Exchange Server and SharePoint, alongside developer tooling and endpoint management platforms — organizations running Microsoft software should prioritize patching, with special attention to systems related to CVE-2026-56164 given confirmed active exploitation.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0872
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