Threat Intelligence / CVE / CVE-2026-34348

CVE-2026-34348 — Microsoft Windows 10 Version 1809

CVSS v3.1 6.5 (MEDIUM) · EPSS 0.7% (higher than 50.1% of all scored CVEs) · Priority 5.3/10 · Published 2026-07-14

As of 2026-07-30, CVE-2026-34348 is a MEDIUM-severity vulnerability in Microsoft Windows 10 Version 1809, CVSS v3.1 6.5, EPSS 0.7% (50.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-34348, most recently “Pass-ta-key: Novel Attack Surface in Google Password Manager Synced Passkey Authentication”.

Last updated: 2026-07-30

What is CVE-2026-34348?

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

The record classifies CVE-2026-34348 under weakness class CWE-693. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 69 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 6.5 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
EPSS (FIRST): 0.7% probability of exploitation in the next 30 days, higher than 50.1% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 5.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-07-14, last modified 2026-07-30

Is CVE-2026-34348 being exploited?

No public exploitation evidence for CVE-2026-34348 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-30. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

Microsoft: Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2025

How to fix CVE-2026-34348

The record marks a vendor fix as available for CVE-2026-34348. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34348. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34348. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-34348

1 tracked threat in the Threadlinqs corpus references CVE-2026-34348, either in the campaign’s CVE list or as an indicator on the campaign record.

Pass-ta-key: Novel Attack Surface in Google Password Manager Synced Passkey Authentication — CRITICAL · 2026-08-03

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-03. This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

msrc.microsoft.com — vendor advisory

Full detection coverage & IOCs for threats exploiting CVE-2026-34348 are available via the Threadlinqs MCP server (Purple tier). View plans →

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