CVE-2026-83865

Relative path traversal in Windows Internet (wininet.dll) allows an authorized attacker to perform tampering locally.

CVSS 3.1

4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-25)

CWE

CWE-23

Published

2026-10-13

Modified

2026-10-21

Record from

the NVD, synced 2026-10-22

Affected

• microsoft:windows_10_1607
• microsoft:windows_10_1809
• microsoft:windows_10_21h2
• microsoft:windows_10_22h2
• microsoft:windows_11_23h2
• microsoft:windows_11_24h2
• microsoft:windows_11_25h2
• microsoft:windows_11_26h1
• microsoft:windows_11_26h2
• microsoft:windows_server_2012
• microsoft:windows_server_2016
• microsoft:windows_server_2019
• microsoft:windows_server_2022
• microsoft:windows_server_2025

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83865

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