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Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Use CWE-1390, Microsoft vendor hub and Exchange Server product page to widen CVE-2025-59249 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-53782, CVE-2025-53786 and CVE-2025-64666 for nearby disclosures in the same product family. Additional editorial context is available in Weekly Security Roundup: Navigating the April 2026 Threat Landscape and Critical Framework Exploits.