---
id: CVE-2026-34348
title: >-
  Protection mechanism failure in Windows Event Logging Service allows an
  authorized attacker to disclose information over a network.
summary: >-
  Protection mechanism failure in Windows Event Logging Service allows an
  authorized attacker to disclose information over a network.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-693
vendor: microsoft
product: windows_10_1809
affected:
  - windows_10_1809 < 10.0.17763.9020
  - windows_10_21h2 < 10.0.19044.7548
  - windows_10_22h2 < 10.0.19045.7548
  - windows_11_23h2 < 10.0.22631.7376
  - windows_11_24h2 < 10.0.26100.8875
  - windows_11_25h2 < 10.0.26200.8875
  - windows_11_26h1 < 10.0.28000.2269
  - windows_server_2019 < 10.0.17763.9020
  - windows_server_2022 < 10.0.20348.5386
  - windows_server_2025 < 10.0.26100.33158
patched:
  - windows_10_1809 10.0.17763.9020
  - windows_10_21h2 10.0.19044.7548
  - windows_10_22h2 10.0.19045.7548
  - windows_11_23h2 10.0.22631.7376
  - windows_11_24h2 10.0.26100.8875
  - windows_11_25h2 10.0.26200.8875
  - windows_11_26h1 10.0.28000.2269
  - windows_server_2019 10.0.17763.9020
  - windows_server_2022 10.0.20348.5386
  - windows_server_2025 10.0.26100.33158
published: '2026-07-14'
updated: '2026-07-16'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34348'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34348'
    label: secure@microsoft.com
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.00907
epssPercentile: 0.58406
ingestedAt: '2026-07-17T13:12:08.561Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/HORKimhab/CVE-2026-34348'
  checkedAt: '2026-09-24T07:53:02.583Z'
exploitAvailable: true
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-16T15:04:55.186927Z'
---

## Overview

Protection mechanism failure in Windows Event Logging Service allows an authorized attacker to disclose information over a network.

## Affected

- `windows_10_1809 < 10.0.17763.9020`
- `windows_10_21h2 < 10.0.19044.7548`
- `windows_10_22h2 < 10.0.19045.7548`
- `windows_11_23h2 < 10.0.22631.7376`
- `windows_11_24h2 < 10.0.26100.8875`
- `windows_11_25h2 < 10.0.26200.8875`
- `windows_11_26h1 < 10.0.28000.2269`
- `windows_server_2019 < 10.0.17763.9020`
- `windows_server_2022 < 10.0.20348.5386`
- `windows_server_2025 < 10.0.26100.33158`

## Remediation

Upgrade past the affected range:

- `windows_10_1809 10.0.17763.9020`
- `windows_10_21h2 10.0.19044.7548`
- `windows_10_22h2 10.0.19045.7548`
- `windows_11_23h2 10.0.22631.7376`
- `windows_11_24h2 10.0.26100.8875`
- `windows_11_25h2 10.0.26200.8875`
- `windows_11_26h1 10.0.28000.2269`
- `windows_server_2019 10.0.17763.9020`
- `windows_server_2022 10.0.20348.5386`
- `windows_server_2025 10.0.26100.33158`