8.8high
CVE-2026-78439
Microsoft Office Graphics Component Remote Code Execution Vulnerability
Published 2 mo ago · modified 8 d ago · JSON
CVSS
8.8
v3.1 · CNA
CISA KEV
No
not known exploited
EPSS
0.8%
percentile 58%
Public exploits
0
none known
Summary
Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
CISA SSVC assessment
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 1 mo ago
Exploit prediction (EPSS)
0.84% probability of exploitation in the next 30 days, higher than 58% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Microsoft Office 365 for Mac
- Microsoft Microsoft Office for Android
- 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-2026-78439 · vendor-advisory, patch
Sources
- CVE List: CVE-2026-78439
- NVD: CVE-2026-78439
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