Microsoft Excel Remote Code Execution Vulnerability
Priority LOW 37CWE-416Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.
Summary
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00503 43rd percentileScored 2026-11-07
Fix Fixed Microsoft: 2 updates
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 to before https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases | Patch available | CNA |
| Microsoft | Microsoft Excel 2016 | 16.0.0.0 to before 16.0.5543.1000 | 16.0.5543.1000 | Patch available | CNA |
| Microsoft | Microsoft Office 2019 | 19.0.0 to before https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases | Patch available | CNA |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 to before https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases | Patch available | CNA |
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0 to before https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases | Patch available | CNA |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 to before 16.107.26030819 | 16.107.26030819 | Patch available | CNA |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 to before 16.107.26030819 | 16.107.26030819 | Patch available | CNA |
| Microsoft | Office Online Server | 16.0.0.0 to before 16.0.10417.20102 | 16.0.10417.20102 | Patch available | CNA |
- Microsoft 365 Apps for Enterprise VendorMicrosoft Affected 16.0.1 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
- Microsoft Excel 2016 VendorMicrosoft Affected 16.0.0.0 to before 16.0.5543.1000 Fixed in 16.0.5543.1000 Patch available CNA
- Microsoft Office 2019 VendorMicrosoft Affected 19.0.0 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
- Microsoft Office LTSC 2021 VendorMicrosoft Affected 16.0.1 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
- Microsoft Office LTSC 2024 VendorMicrosoft Affected 16.0.0 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
- Microsoft Office LTSC for Mac 2021 VendorMicrosoft Affected 16.0.1 to before 16.107.26030819 Fixed in 16.107.26030819 Patch available CNA
- Microsoft Office LTSC for Mac 2024 VendorMicrosoft Affected 16.0.0 to before 16.107.26030819 Fixed in 16.107.26030819 Patch available CNA
- Office Online Server VendorMicrosoft Affected 16.0.0.0 to before 16.0.10417.20102 Fixed in 16.0.10417.20102 Patch available CNA
CPE configurations NVD · 13
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:* | 2016 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:* | 2016 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:* | 2019 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:* | 2019 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:* | 2021 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:* | 2021 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:* | 2021 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:* | 2024 | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:* Versions 2016 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:* Versions 2016 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:* Versions 2019 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:* Versions 2019 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:* Versions 2021 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:* Versions 2021 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:* Versions 2021 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:* Versions 2024 Vulnerable ·Microsoft
Show 3 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:* | 2024 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:* | 2024 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:* | before 16.0.10417.20102 | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:* Versions 2024 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:* Versions 2024 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:* Versions before 16.0.10417.20102 Vulnerable ·Microsoft
Remediation
Vendor assessments
Microsoft
Microsoft's page for this CVE →
- Impact
- Remote Code Execution
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
| Product | Status | Plan or fix |
|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office 2019 for 32-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office 2019 for 64-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2021 for 32-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2021 for 64-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2024 for 32-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2024 for 64-bit editions | Fixed | https · //aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC for Mac 2021 | Fixed | 16.107.26030819 · Security Update |
| Microsoft Office LTSC for Mac 2024 | Fixed | 16.107.26030819 · Security Update |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-26107
- 2026-10-03 Alias added: GHSA-88fm-v3h6-578f
References
More Microsoft 365 Apps vulnerabilities
- TI-2024-14173 Microsoft Outlook Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2023-09240 Microsoft Outlook Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2024-25471 Microsoft Project Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
- TI-2023-17652 Microsoft Outlook Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
- TI-2026-17368 Microsoft Word Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 7.8
- TI-2026-17363 Microsoft Office Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 7.8
Sources
- CVE-2026-26107 · CVE Program
- CVE-2026-26107 · NVD
- FIRST EPSS
- GHSA-88fm-v3h6-578f · GitHub Advisory Database · CC BY 4.0
- CVE-2026-26107 · Microsoft Security Update Guide
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences