CVE-2026-87692High· 7.8▾ TwilightDeserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0.3 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
1.6%
1.6% → 1.7%
Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-62912Medium· 6.5Microsoft Exchange Server Denial of Service Vulnerability
CVE-2026-55009High· 7.8Microsoft Exchange Server Elevation of Privilege Vulnerability
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CVE-2026-87696High· 7.5Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CVE-2026-87695High· 7.8Inclusion of functionality from untrusted control sphere in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
CVE-2026-77910High· 8.8Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.