CVE-2026-70019Network attack vector

Information disclosure via compressed-folder hard link

Published Sep 8, 2026 · Updated Sep 9, 2026

Information disclosure in Microsoft Windows Compressed Folder allows remote attackers to read data through a crafted compressed folder. The archive handler does not block an embedded Windows hard link from resolving to data outside the archive's intended contents. Exploitation requires a user to open the attacker-supplied item, and the reported consequence is data disclosure without modification or service interruption.

CVSS severity6.5
Medium
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Microsoft Windows Compressed Folder allows remote attackers to read data through a crafted compressed folder. The archive handler does not block an embedded Windows hard link from resolving to data outside the archive's intended contents. Exploitation requires a user to open the attacker-supplied item, and the reported consequence is data disclosure without modification or service interruption.

The record

CVE
CVE-2026-70019
Published
Sep 8, 2026
Updated
Sep 9, 2026
Vendor
Microsoft
Product
Windows Server 2025 (Server Core installation)
Classifications
CWE-65, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.26100.0 <10.0.26100.33438

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33438
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.9445
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.9445
Microsoft · Windows 11, version 26H1version=10.0.28000.0 <10.0.28000.2954
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.7582
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.33438

Published CVSS scores

6.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-65Windows Hard Link
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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