CVE-2025-30038

Session ID leakage in Zone.Identifier of downloaded files

Published Aug 27, 2025 CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Description
The vulnerability consists of a session ID leak when saving a file downloaded from CGM CLININET. The identifier is exposed through a built-in Windows security feature that stores additional metadata in an NTFS alternate data stream (ADS) for all files downloaded from potentially untrusted sources.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-27766 The vulnerability consists of a session ID leak when saving a file downloaded from CGM CLININET. The identifier is exposed through a built-in Windows security feature that stores additional metadata in an NTFS alternate data stream (ADS) for all files downloaded from potentially untrusted sources.
History
Type Values Removed Values Added
First Time appeared Microsoft
Microsoft windows
Vendors & Products Microsoft
Microsoft windows
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description The vulnerability consists of a session ID leak when saving a file downloaded from CGM CLININET. The identifier is exposed through a built-in Windows security feature that stores additional metadata in an NTFS alternate data stream (ADS) for all files downloaded from potentially untrusted sources.
Title Session ID leakage in Zone.Identifier of downloaded files
Weaknesses CWE-1230
References
Metrics cvssV4_0

{'score': 7.3, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
CERT-PL
Published
Updated
Aug 27, 2025, 4:11 PM
Reserved
Mar 14, 2025, 2:54 PM
Status
Deferred
Published
Aug 27, 2025, 11:15 AM
Modified
Jun 17, 2026, 9:08 AM