8.8

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

CVSS: 8.8v3.1HighKEVAnalyzed
Published 11-07-2023Last modified 07-10-2026
Open JSON

Vulnerability summary

CVE-2023-35311 is a high (CVSS 8.8) vulnerability in Microsoft Outlook. It is known to be exploited: CISA lists it, first on 11-07-2023. EPSS estimates a 15.52% chance of exploitation in the next 30 days, higher than 96.7% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
15.52%
0%100%
Medium · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-07-2023
    PublishedVulnerability first disclosed.
  2. 11-07-2023
    Added to CISA KEVMicrosoft Outlook Security Feature Bypass Vulnerability
  3. 01-08-2023
    CISA remediation dueApply updates per vendor instructions or discontinue use of the product if updates are unavailable.
  4. 07-10-2026
    Last modifiedVulnerability information updated.

Description

Microsoft Outlook Security Feature Bypass Vulnerability

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

15.52%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

0.00 pp

From 15.52% on 20-09-2026

20-09-202620-10-2026
EPSS score
15.52%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
11-07-2023
Federal due date
01-08-2023

CISA required action

Apply updates per vendor instructions or discontinue use of the product if updates are unavailable. msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-35311 nvd.nist.gov/vuln/detail/CVE-2023-35311

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft10 products

1 vendor · 10 products

References

2 links