CVE-2026-83856

Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute code over a network.

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-10-13

Modified

2026-10-21

Record from

the NVD, synced 2026-10-22

Affected

• microsoft:windows_11_23h2
• microsoft:windows_11_24h2
• microsoft:windows_11_25h2
• microsoft:windows_11_26h1
• microsoft:windows_11_26h2
• microsoft:windows_server_2022
• microsoft:windows_server_2025

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83856

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