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CVE-2023-35311

Microsoft Outlook Security Feature Bypass

8.8 HIGHActively exploited (CISA KEV)EPSS 15.5%
  1. Published11 Jul 2023
  2. Added to CISA KEV11 Jul 2023
  3. Remediation due1 Aug 2023
Actively exploited (CISA KEV)

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

Added to KEV: 11 Jul 2023Federal remediation due: 1 Aug 2023

Description

Microsoft Outlook Security Feature Bypass Vulnerability

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Microsoft 365 Appsall versions
Microsoft Office 2019all versions
Microsoft Office 2021all versions
Microsoft Outlook2013 · 2016

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2023-35311 being actively exploited?

Yes. CVE-2023-35311 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 11 Jul 2023.

How severe is CVE-2023-35311?

CVE-2023-35311 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 15.5% probability of exploitation.

Which products are affected by CVE-2023-35311?

Affected products include Microsoft 365 Apps, Microsoft Office 2019, Microsoft Office 2021, Microsoft Outlook.

How do I fix CVE-2023-35311?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-35311 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.