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.NET Core Tampering Vulnerability

Assessment

A tampering vulnerability exists when .NET Core improperly handles specially crafted files. An attacker who successfully exploited this vulnerability could write arbitrary files and directories to certain locations on a vulnerable system. However, an attacker would have limited control over the destination of the files and directories. To exploit the vulnerability, an attacker must send a specially crafted file to a vulnerable system. The security update fixes the vulnerability by ensuring .NET Core properly handles files.

Severity
Important
CVSS base score
4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C
Impact
Tampering
EPSS, next 30 days
0.6%Higher than 48.5% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
.NET
Weakness
CWE-36: Absolute Path Traversal
Issued by
Microsoft
Published
12 May 2026 · May 2026
Last revised
19 May 2026Removed incorrectly added rows from the Security Updates table. This is an informational change only.

Updates that fix it

3 KBs
KBTypeRestartApplies toOther CVEs
KB5093446 Security Update — .NET 10.0 installed on Windows All CVEs in KB5093446
KB5093447 Security Update — .NET 8.0 installed on Windows All CVEs in KB5093447
KB5093448 Security Update — .NET 9.0 installed on Windows All CVEs in KB5093448

Affected products

Developer Tools
6 affected products
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