Microsoft Exchange Server Subscription Edition vulnerabilities
40 vulnerabilities
Known vulnerabilities in Microsoft Exchange Server Subscription Edition, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.
CVE-2025-59249microsoftexchange_server+5
EPSS score0.83%
Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.CVE-2025-59248microsoftexchange_server+5EPSS score1.02%
Improper input validation in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.CVE-2025-25005microsoftexchange_server+5EPSS score1.41%
Improper input validation in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.CVE-2025-25006microsoftexchange_server+5EPSS score0.89%
Improper handling of additional special element in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.CVE-2025-25007microsoftexchange_server+5EPSS score0.87%
Improper validation of syntactic correctness of input in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.CVE-2025-53782microsoftexchange_server+5EPSS score0.36%
Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.CVE-2025-53786microsoftexchange_server+5EPSS score7.71%
On April 18th 2025, Microsoft announced Exchange Server Security Changes for Hybrid Deployments and accompanying non-security Hot Fix. Microsoft made these changes in the general interest of improving the security of hybrid Exchange deployments. Following further investigation, Microsoft identified specific security implications tied to the guidance and configuration steps outlined in the April announcement. Microsoft is issuing CVE-2025-53786 to document a vulnerability that is addressed by taking the steps documented with the April 18th announcement. Microsoft strongly recommends reading the information, installing the April 2025 (or later) Hot Fix and implementing the changes in your Exchange Server and hybrid environment.CVE-2025-64666microsoftexchange_server+5EPSS score1.02%
Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.CVE-2025-64667microsoftexchange_server+5EPSS score0.80%
User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.CVE-2025-33051microsoftexchange_server+5EPSS score1.27%
Exposure of sensitive information to an unauthorized actor in Microsoft Exchange Server allows an unauthorized attacker to disclose information over a network.CVE-2026-21527microsoftexchange_server+5EPSS score8.26%
User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.CVE-2026-55006microsoftexchange_server+5EPSS score0.30%
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.CVE-2026-55008microsoftexchange_server+5EPSS score0.86%
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.CVE-2026-55005microsoftexchange_server+5EPSS score1.01%
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.CVE-2026-55007microsoftexchange_server+4EPSS score0.71%
Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.CVE-2026-55009microsoftexchange_server+5EPSS score2.51%
Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.CVE-2026-65813microsoftexchange_server+5EPSS score0.94%
Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.CVE-2026-62912microsoftexchange_server+5EPSS score1.98%
Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service over a network.CVE-2026-62913microsoftexchange_server+5EPSS score0.91%
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.CVE-2026-62910microsoftexchange_server+5EPSS score1.00%
Improper control of resource identifiers ('resource injection') in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.