CVE-2026-87692

7.8High

Published 13 Oct 2026 · NVD status: Undergoing Analysis · AI triage by gemini-3.8-flash

7.8High

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-502

Impact

An authenticated local attacker can elevate privileges to compromise the host. They need local access and an existing low-privileged account on the system.

Root cause

The application unsafely deserializes untrusted user-supplied data.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Apply the official security update from the vendor advisory when available. If patching must wait, restrict local access and service logon rights to the Exchange host.

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87692

Source: nvd.nist.gov/vuln/detail/CVE-2026-87692