PT-2026-40142 · Microsoft · Windows Event Logging Service+1

George Hughey + 1 · CVE-2026-33834 · Published 2026-05-12 · Updated 2026-05-15

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Event Logging Service (affected versions not specified)

Description Improper access control in the Windows Event Logging Service allows an authorized attacker to elevate privileges locally.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

BDU:2026-06603

CVE-2026-33834

Affected Products

Windows

Windows Event Logging Service

References · 8

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33834 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33834 · Security Note
• https://bdu.fstec.ru/vul/2026-06603 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33834 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-33834 · Vendor Advisory
• https://twitter.com/f1tym1/status/2055171266919739487 · Twitter Post
• https://twitter.com/windowsforum/status/2054257528381313478 · Twitter Post
• https://t.me/cveNotify/163463 · Telegram Post