CVE-2023-35311
high CISA KEVMicrosoft Outlook Security Feature Bypass Vulnerability
Vendor / product: Microsoft — Outlook
Microsoft Outlook Security Feature Bypass Vulnerability
CVSS
8.8
8.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (secure@microsoft.com)
Timeline (UTC)
Published: 2023-07-11 18:15
Modified: 2026-10-08 10:35
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Listed in CISA KEV
Added 2023-07-11 · due 2023-08-01
Known ransomware use: Unknown
Required action (CISA)
Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Affected products
microsoft / 365_apps all versions
microsoft / office_2019 all versions
microsoft / office_2021 all versions
microsoft / outlook 2013, 2016
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311
Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311
Patch / mitigation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311
Patch / mitigation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311 secure@microsoft.com
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311 af854a3a-2127-422b-91ae-364da2661108
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-35311 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
CISA KEV — fetched 2026-10-27 06:50 UTC · record ↗
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗