CVE-2026-88156 json
Microsoft Office Outlook Remote Code Execution Vulnerability
published 2026-10-13 26 d ago modified 2026-10-31 8 d ago also EUVD-2026-99728
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Patch / fix
- Microsoft Microsoft Office 365 for Mac 16.114.26101123
- Microsoft Microsoft Office LTSC 2021 16.0.14334.20974
- Microsoft Microsoft Office LTSC 2024 16.0.17932.21056
- Microsoft Microsoft Office LTSC for Mac 2021 16.114.26101123
- Microsoft Microsoft Office LTSC for Mac 2024 16.114.26101123
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 32 d ago
Exploit prediction
1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Microsoft 365 Apps for Enterprise
- Microsoft Microsoft Office 365 for Mac
- Microsoft Microsoft Office LTSC 2021
- Microsoft Microsoft Office LTSC 2024
- Microsoft Microsoft Office LTSC for Mac 2021
- Microsoft Microsoft Office LTSC for Mac 2024
Classification
- Weakness
-
- CWE-121 Stack-based Buffer Overflow
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-88156
vendor-advisory, patch
Sources
- CVE List CVE-2026-88156
- NVD CVE-2026-88156
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