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CVE-2026-78439

Microsoft Office Graphics Component Remote Code Execution Vulnerability

HIGH
8.8
CVSS Score
Published: September 8, 2026 at 05:13 PM UTC
Updated: October 14, 2026 at 11:08 PM UTC
5 products affected across 1 vendorOfficeOffice 365365 Apps

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Office· Microsoft
95%
16.0.1 ≤ v < 16.0.20430.2000016.0.1
Affected range stops below 16.0.20430.20000, so it looks safe — our inference, not a vendor statement
Office 365· Microsoft
95%
1.0.0 ≤ v < 16.113.26091433
Affected range stops below 16.113.26091433, so it looks safe — our inference, not a vendor statement
365 Apps· Microsoft
60%
1.0.0 ≤ v < 16.113.260914331.0.0
Affected range stops below 16.113.26091433, so it looks safe — our inference, not a vendor statement
Office 2021· Microsoft
60%
16.0.1 ≤ v < 16.113.2609143316.0.1
Affected range stops below 16.113.26091433, so it looks safe — our inference, not a vendor statement
Office 2024· Microsoft
60%
16.0.0 ≤ v < 16.113.2609143316.0.0
Affected range stops below 16.113.26091433, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No 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-2026-78439

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusUNDERGOING ANALYSIS
CWE
CWE-121

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