Microsoft Exchange Server Subscription Edition vulnerabilities

40 CVEs affecting Microsoft Exchange Server Subscription Edition, 1 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-96940, published 2026-10-02.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2026-42897: Microsoft Exchange Server Cross-Site Scripting Vulnerability, published 2026-05-14. Medium severity, CVSS 6.1. Actively exploited: in CISA KEV since 2026-05-15. EPSS: 0.5% chance of exploitation in the next 30 days. 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-2026-21527, published 2026-02-10. Medium severity, CVSS 6.5. EPSS: 8.3% chance of exploitation in the next 30 days. User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
• CVE-2025-53786, published 2025-08-06. High severity, CVSS 8.0. EPSS: 7.7% chance of exploitation in the next 30 days. 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…
• CVE-2026-55009, published 2026-07-14. High severity, CVSS 7.8. EPSS: 2.5% chance of exploitation in the next 30 days. Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
• CVE-2026-62912, published 2026-08-11. Medium severity, CVSS 6.5. EPSS: 2% chance of exploitation in the next 30 days. Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service over a network.
• CVE-2025-25005, published 2025-08-12. Medium severity, CVSS 6.5. EPSS: 1.4% chance of exploitation in the next 30 days. Improper input validation in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.
• CVE-2025-33051, published 2025-08-12. High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days. Exposure of sensitive information to an unauthorized actor in Microsoft Exchange Server allows an unauthorized attacker to disclose information over a network.
• CVE-2026-69378, published 2026-09-08. High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days. Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
• CVE-2025-64666, published 2025-12-09. High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days. Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
• CVE-2025-59248, published 2025-10-14. High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days. Improper input validation in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Latest

• CVE-2026-96940, published 2026-10-02. High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days. Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
• CVE-2026-69641, published 2026-09-08. Critical severity, CVSS 9.1. EPSS: 0.9% chance of exploitation in the next 30 days. Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
• CVE-2026-69382, published 2026-09-08. Medium severity, CVSS 5.9. EPSS: 0.5% chance of exploitation in the next 30 days. Use of a broken or risky cryptographic algorithm in Microsoft Exchange Server allows an unauthorized attacker to disclose information over a network.
• CVE-2026-69380, published 2026-09-08. High severity, CVSS 8.1. EPSS: 0.7% chance of exploitation in the next 30 days. Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
• CVE-2026-69375, published 2026-09-08. Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days. Authorization bypass through user-controlled key in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.
• CVE-2026-69361, published 2026-09-08. Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days. Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network.
• CVE-2026-69356, published 2026-09-08. Critical severity, CVSS 9.3. EPSS: 0.8% chance of exploitation in the next 30 days. 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-2026-69355, published 2026-09-08. High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days. External control of file name or path in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
• CVE-2026-55007, published 2026-09-08. High severity, CVSS 8.1. EPSS: 0.7% chance of exploitation in the next 30 days. Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.