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High 8.8Known exploited (CISA KEV)Published Jul 11, 2023
CVE-2023-35311Microsoft Outlook Security Feature Bypass Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft 365 Apps for Enterprise and 8 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jul 11, 2023; federal agencies had to remediate by Aug 1, 2023. Treat that date as your deadline.
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Microsoft Outlook Security Feature Bypass Vulnerability
- CVSS
- 8.8 HIGH (v3.1, CNA)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
- Weakness (CWE)
- CWE-367
- Known exploited
- Added to CISA KEV Jul 11, 2023; federal remediation due Aug 1, 2023Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
- EPSS (exploitation in the next 30 days)
- 15.52% (percentile 97)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft 365 Apps for Enterprise microsoft:365_apps_for_enterprise (from the name) | from 16.0.1 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office LTSC 2021 microsoft:office_ltsc_2021 (from the name) | from 16.0.1 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office 2019 microsoft:office_2019 (from the name) | from 19.0.0 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Outlook 2016 microsoft:outlook_2016 (from the name) | from 16.0.0.0 before 16.0.5404.1000 | CNA record |
Microsoft Microsoft Outlook 2013 microsoft:outlook_2013 (from the name) | from 14.0.0 before 15.0.5571.1000 | CNA record |
Microsoft Microsoft Outlook 2013 Service Pack 1 microsoft:outlook_2013_service_pack_1 (from the name) | from 15.0.0.0 before 15.0.5571.1000 | CNA record |
microsoft 365_apps microsoft:365_apps | all versions | NVD |
microsoft office_2019 microsoft:office_2019 | all versions; all versions | NVD |
microsoft office_2021 microsoft:office_2021 | all versions; all versions | NVD |
microsoft outlook microsoft:outlook | 2013; 2013; 2016 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311vendor-advisory, patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-35311us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.