Read the docs
TI-2023-09239 Aliases CVE-2023-23396GHSA-gp6v-q35c-7fh4

Microsoft Excel Denial of Service Vulnerability

Priority LOW 35CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Microsoft Excel Denial of Service Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03829 90th percentileScored 2026-11-07
Fix Fixed Microsoft: 1 update

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Office Online Server16.0.1 to before 16.0.10396.2000016.0.10396.20000Patch availableCNA
MicrosoftMicrosoft Office Web Apps Server 2013 Service Pack 115.0.1 to before 15.0.5537.100015.0.5537.1000Patch availableCNA
  • Microsoft Office Online Server VendorMicrosoft Affected 16.0.1 to before 16.0.10396.20000 Fixed in 16.0.10396.20000 Patch available CNA
  • Microsoft Office Web Apps Server 2013 Service Pack 1 VendorMicrosoft Affected 15.0.1 to before 15.0.5537.1000 Fixed in 15.0.5537.1000 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:office_online_server:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:a:microsoft:office_web_apps_server:2013:sp1:*:*:*:*:*:*2013 sp1VulnerableMicrosoft
  • cpe:2.3:a:microsoft:office_online_server:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:office_web_apps_server:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft

Remediation

Microsoft 1 update

  • KB5002356
    Security Update
    • Microsoft Office Online Server 16.0.10396.20000

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Denial of Service
Exploited
No
Publicly disclosed
—
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft Office Web Apps Server 2013 Service Pack 1Fixed 15.0.5537.1000 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-23396
  2. 2026-10-03 Alias added: GHSA-gp6v-q35c-7fh4
  3. 2026-10-21 EPSS moved to the 90th–95th percentile

References

Patch 1

  • TI-2017-08774 Memory corruption in Microsoft Office KEVCVSS 3.1HIGH 7.8
  • TI-2023-08100 Microsoft Word Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2021-13528 Microsoft Excel Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
  • TI-2023-15335 Microsoft Excel Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2023-16312 Microsoft Excel Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2018-00733 Out-of-bounds write in Microsoft Word CVSS 3.0HIGH 8.8
See all 280 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences