CVE-2023-35311

HIGH8.8

CISA KEV

Published 2023-07-11 · Updated 2026-10-08 · Source secure@microsoft.com

Summary

CVE-2023-35311 is a high-severity (CVSS 8.8) vulnerability in Microsoft Outlook. CISA added it to the Known Exploited Vulnerabilities catalog on July 11, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by August 1, 2023. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

Microsoft Outlook Security Feature Bypass Vulnerability

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

CWE-367CWE-367

CISA Known-Exploited Vulnerability

Product: Microsoft — Outlook

Name: Microsoft Outlook Security Feature Bypass Vulnerability

Date added: 2023-07-11 · Due: 2023-08-01

Required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

References

View on NVD

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