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Full vulnerability report · 2026
CVE-2026-34348High confidence

Windows Event Logging Service Information Disclosure Vulnerability

Microsoft · Windows 10 Version 1809

6.5MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-43788

No EUVD known-exploited evidence

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

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
6.5 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

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

What

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

Why

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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

Why

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Protection Mechanism Failure → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-693 ↗

CWE-693: Protection Mechanism Failure. The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
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

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-693
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-43788Official EUVD mapping

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

Official EUVD record
BSI · German · WID-SEC-W-2026-2316Microsoft Windows Produkte: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Windows Produkten ausnutzen, um seine Privilegien zu erhöhen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um falsche Informationen darzustellen, um Daten zu manipulieren, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0869Multiples vulnérabilités dans Microsoft Windows

la sécurité des systèmes d'information Paris, le 15 juillet 2026 N° CERTFR-2026-AVI-0869 Affaire suivie par: CERT-FR Avis du CERT-FR Objet: Multiples vulnérabilités dans Microsoft Windows Gestion du document Référence CERTFR-2026-AVI-0869 Titre Multiples vulnérabilités dans Microsoft Windows Date de la première version 15 juillet 2026 Date de la dernière version 15 juillet 2026 Source(s) Bulletin de sécurité Microsoft Windows CVE-2026-33842 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-34328 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-34346 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-34348 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-34349 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-40378 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-40400 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-40422 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-41087 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-42900 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-42975 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-2026-42982 du 14 juillet 2026 Bulletin de sécurité Microsoft Windows CVE-202

Official advisory
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-22Aggiornamenti Mensili Microsoft

nuova finestra - - CVE-2026-45488 : apre una nuova finestra - - CVE-2026-44806 : apre una nuova finestra - - CVE-2026-44800 : apre una nuova finestra - - CVE-2026-42990 : apre una nuova finestra - - CVE-2026-42982 : apre una nuova finestra - - CVE-2026-42975 : apre una nuova finestra - - CVE-2026-42900 : apre una nuova finestra - - CVE-2026-41109 : apre una nuova finestra - - CVE-2026-41106 : apre una nuova finestra - - CVE-2026-41087 : apre una nuova finestra - - CVE-2026-40422 : apre una nuova finestra - - CVE-2026-40400 : apre una nuova finestra - - CVE-2026-40378 : apre una nuova finestra - - CVE-2026-34349 : apre una nuova finestra - - CVE-2026-34348 : apre una nuova finestra - - CVE-2026-34346 : apre una nuova finestra - - CVE-2026-34328 : apre una nuova finestra - - CVE-2026-33842 : apre una nuova finestra - - CVE-2026-26145 : apre una nuova finestra - - Riferimenti (3) https://msrc.microsoft.com/update-guide/releaseNote/2026-jul https://msrc.microsoft.com/update-guide https://support.microsoft.com/en-us/servicing/os/windows/docs/2026/07/kb5121391-cve-2026-56155-ad-fs-dkm-container-acl-hardening Change log Titolo della tabella Versione Note Data 1.0 Pubblicato il 16-07-2026 16/07/2026 1.1 Aggiunta sezione Azioni di mitigazione e aggiornata sezione Riferimenti 16/07/2026 1.2 Aggiornata

Official advisory
NCSC-NL · Dutch · NCSC-2026-0231Kwetsbaarheden verholpen in Microsoft Windows

A protection mechanism failure in the Windows Event Logging Service enables an authorized attacker to disclose information over a network, potentially exposing sensitive data.

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
10.0.17763.0 < 10.0.17763.9020; 10.0.19044.0 < 10.0.19044.7548; 10.0.19045.0 < 10.0.19045.7548; 10.0.22631.0 < 10.0.22631.7376; 10.0.26100.0 < 10.0.26100.8875; 10.0.26200.0 < 10.0.26200.8875; 10.0.28000.0 < 10.0.28000.2525
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 14 Jul 2026 · Last source change 9 Sept 2026, 19:36 UTC · CWE-693 · Protection Mechanism Failure

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-43788
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-43788↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-34348 · cve.blacktree.nl