CVE-2023-35311 — Microsoft Outlook Security Feature Bypass Vulnerability

Executive Summary

None

Overview

8.8

CVSS HIGH

Important

MS Severity

Exploited

MS Exploit Status

Exploitation Detected

MS Exploit Likelihood

Category Security Feature Bypass

Released Jul 11 2023

Last Updated Jul 11 2023

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.15028 — 0.96292 percentile

NVD CVSS 8.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Functional

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 8.2

EPSS Score

0.15028

probability of exploitation in the next 30 days

0.96292 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

11 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft 365 Apps for Enterprise for 32-bit Systems	`Click to Run (Security Update)`	Important	Security Feature Bypass	No
Microsoft 365 Apps for Enterprise for 64-bit Systems	`Click to Run (Security Update)`	Important	Security Feature Bypass	No
Microsoft Office 2019 for 32-bit editions	`Click to Run (Security Update)`	Important	Security Feature Bypass	No
Microsoft Office 2019 for 64-bit editions	`Click to Run (Security Update)`	Important	Security Feature Bypass	No
Microsoft Office LTSC 2021 for 32-bit editions	`Click to Run (Security Update)`	Important	Security Feature Bypass	No
Microsoft Office LTSC 2021 for 64-bit editions	`Click to Run (Security Update)`	Important	Security Feature Bypass	No
Microsoft Outlook 2013 (32-bit editions)	`5002432 (Security Update)`	Important	Security Feature Bypass	Maybe
Microsoft Outlook 2013 (64-bit editions)	`5002432 (Security Update)`	Important	Security Feature Bypass	Maybe
Microsoft Outlook 2013 RT Service Pack 1	`5002432 (Security Update)`	Important	Security Feature Bypass	Maybe
Microsoft Outlook 2016 (32-bit edition)	`5002427 (Security Update)`	Important	Security Feature Bypass	Maybe
Microsoft Outlook 2016 (64-bit edition)	`5002427 (Security Update)`	Important	Security Feature Bypass	Maybe

Patches

3 patches

Article	Type	Restart
`Click to Run`	Security Update	No
`5002432`	Security Update	Maybe
`5002427`	Security Update	Maybe

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Anonymous

References

MSRC Advisory MITRE NVD