CVE-2026-88135

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-862

Impact

A local attacker with an existing account can elevate privileges to take full control of the system. They require local access and low-level authorization to trigger it.

Root cause

Improper access control in the WebDAV service fails to restrict unauthorized operations.

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

Install the security update from Microsoft's MSRC advisory. As a temporary workaround, stop and disable the WebClient service (WebDAV) if patching cannot be done immediately.

shell

$ powershell -Command "Stop-Service WebClient -PassThru | Set-Service -StartupType Disabled"

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

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NVD description

Improper access control in WebDAV allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88135

Source: nvd.nist.gov/vuln/detail/CVE-2026-88135