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CVE-2023-35311

Microsoft Outlook Security Feature Bypass Vulnerability

HIGH
8.8
CVSS Score
Published: July 11, 2023 at 05:03 PM UTC
Updated: October 8, 2026 at 10:35 AM UTC
6 products affected across 1 vendorOffice365 AppsOffice 2021

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Severity
HIGH8.8
Exploitation
CISA KEV
Exploit prediction
EPSS 16%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score15.5%

EPSS (Exploit Prediction Scoring System) estimates a 15.5% chance this CVE is exploited in the wild within the next 30 days — higher than 97% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt.

Required Action
Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Ransomware Use
Unknown
Added to KEV
Jul 11, 2023
Remediation Due
Aug 1, 2023
1186 days overdue
Notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-35311
https://nvd.nist.gov/vuln/detail/CVE-2023-35311

Description

Microsoft Outlook Security Feature Bypass Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

365 Apps· Microsoft
95%
16.0.1 ≤ v < https://aka.ms/OfficeSecurityReleases-16.0.1
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office· Microsoft
95%
19.0.0 ≤ v < https://aka.ms/OfficeSecurityReleases
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office 2019· Microsoft
95%
19.0.0 ≤ v < https://aka.ms/OfficeSecurityReleases-19.0.0
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office 2021· Microsoft
95%
16.0.1 ≤ v < https://aka.ms/OfficeSecurityReleases-16.0.1
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Office Long Term Servicing Channel· Microsoft
95%
16.0.1 ≤ v < https://aka.ms/OfficeSecurityReleases
Affected range stops below https://aka.ms/OfficeSecurityReleases, so it looks safe — our inference, not a vendor statement
Outlook· Microsoft
95%
14.0.0 ≤ v < 15.0.5571.100015.0.0.0 ≤ v < 15.0.5571.100016.0.0.0 ≤ v < 16.0.5404.100014.0.015.0.0.016.0.0.020132013 sp12016
Affected range stops below 15.0.5571.1000, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.5404.1000, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-35311

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-367

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