Description
Protection mechanism failure in Windows Event Logging Service allows an authorized attacker to disclose information over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – < 10.0.17763.9020 | 10.0.17763.9020 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 – < 10.0.19044.7548 | 10.0.19044.7548 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 – < 10.0.19045.7548 | 10.0.19045.7548 |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 – < 10.0.22631.7376 | 10.0.22631.7376 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – < 10.0.26100.8875 | 10.0.26100.8875 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – < 10.0.26200.8875 | 10.0.26200.8875 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – < 10.0.28000.2525 | 10.0.28000.2525 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – < 10.0.17763.9020 | 10.0.17763.9020 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – < 10.0.17763.9020 | 10.0.17763.9020 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – < 10.0.20348.5386 | 10.0.20348.5386 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – < 10.0.26100.33158 | 10.0.26100.33158 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – < 10.0.26100.33158 | 10.0.26100.33158 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
HORKimhab/CVE-2026-34348 ★ 0 · Aug 10, 2026
CVE-2026-34348 - Draft or TODO
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- WID-SEC-2026-2316 Microsoft Windows Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 6, 2026
- NCSC-2026-0231 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Jul 14, 2026
- MSRC-CVE-2026-34348 Windows Event Logging Service Information Disclosure Vulnerability Microsoft Security Response Center · Jul 14, 2026
References
- Windows Event Logging Service Information Disclosure Vulnerability vendor-advisory patch