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High 8.8Published Sep 8, 2026
CVE-2026-78439Microsoft Office Graphics Component Remote Code Execution Vulnerability
Updated under an hour ago ()
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It affects Microsoft Office 365 for Mac and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
- CVSS
- 8.8 HIGH (v3.1, CNA)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
- Weakness (CWE)
- CWE-121
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- microsoft
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft Office 365 for Mac microsoft:office_365_for_mac (from the name) | from 1.0.0 before 16.113.26091433 | CNA record |
Microsoft Microsoft Office for Android microsoft:office_for_android (from the name) | from 16.0.1 before 16.0.20430.20000 | CNA record |
Microsoft Microsoft Office LTSC for Mac 2021 microsoft:office_ltsc_for_mac_2021 (from the name) | from 16.0.1 before 16.113.26091433 | CNA record |
Microsoft Microsoft Office LTSC for Mac 2024 microsoft:office_ltsc_for_mac_2024 (from the name) | from 16.0.0 before 16.113.26091433 | CNA record |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78439vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.