CVE-2026-42831
Microsoft Office Remote Code Execution Vulnerability
HIGH
7.8
CVSS Score
Published: May 12, 2026 at 04:59 PM UTC
Updated: October 26, 2026 at 12:10 AM UTC
5 products affected across 1 vendorOfficeOffice Long Term Servicing Channel365 Copilot
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Severity
HIGH7.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit
Description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 16.0.19822.20190
Affected range stops below 16.0.19822.20190, so it looks safe — our inference, not a vendor statement
16.0.1 ≤ v < 16.109.2605101916.0.1
Affected range stops below 16.109.26051019, so it looks safe — our inference, not a vendor statement
16.0.0 ≤ v < 16.109.2605101916.0.0
Affected range stops below 16.109.26051019, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.8HIGHmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-122
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