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HIGH severity

CVE-2026-114148 — Microsoft

HIGH

CVE-2026-114148 is a high-severity (CVSS 7.8) Incorrect Default Permissions vulnerability. No vendor fix is recorded yet; mitigation options are listed below.

Incorrect default permissions in ASP.NET Core allows an authorized attacker to elevate privileges locally.

Published
Updated
Affected
—
Patched
—
Exploits
None indexed
Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

Incorrect default permissions in ASP.NET Core allows an authorized attacker to elevate privileges locally.

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2026-114148 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

Frequently Asked Questions

Incorrect default permissions in ASP.NET Core allows an authorized attacker to elevate privileges locally.
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CVE-2026-114148: Microsoft (High 7.8)