[ CVE-2026-88156 · Published 13 Oct 2026 ]
Vulnerability in Microsoft 365 Apps for Enterprise
CVSS 9.8
EPSS <1%3 agency advisoriesNo fix listed yet
[ Why it matters ]Priority signals
- Critical severity: CVSS 9.8
[ Description ]Official description
Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ Advisories ]Government CERT advisories
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CERT-FRCERTFR-2026-AVI-1312
Multiple vulnerabilities in Microsoft Office Translated from French
Multiple vulnerabilities have been discovered in Microsoft Office. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and a breach of data confidentiality. Microsoft reports…
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BSI CERT-BundWID-SEC-2026-3916
Microsoft Office products: Multiple vulnerabilities allow privilege escalation Translated from German
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NCSC-NLNCSC-2026-0422
Vulnerabilities fixed in Microsoft Office Translated from Dutch
[ References ]References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88156Vendor Advisory