Read the docs
TI-2021-13483 Aliases CVE-2021-34451GHSA-pvgh-q9cp-r848

Microsoft Office Online Server Spoofing Vulnerability

Priority LOW 28Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

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

Summary

Microsoft Office Online Server Spoofing Vulnerability

Why it matters now

EPSS 0.01784 78th percentileScored 2026-11-07
Fix Fixed Microsoft Office Online Server (Microsoft): 16.0.10376.20001

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Office Online Server16.0.1 to before 16.0.10376.2000116.0.10376.20001Patch availableCNA
  • Microsoft Office Online Server VendorMicrosoft Affected 16.0.1 to before 16.0.10376.20001 Fixed in 16.0.10376.20001 Patch available CNA

CPE configurations NVD · 1

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

Remediation

  • Fix · CNA Microsoft Office Online Server (Microsoft) Fixed in 16.0.10376.20001

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Spoofing
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft Office Online ServerFixed 16.0.10376.20001 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-34451
  2. 2026-10-03 Alias added: GHSA-pvgh-q9cp-r848

References

Patch 2

  • 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