Vulnerability · Published Sep 8, 2026 · Assigned by microsoft
CVE-2026-78439Microsoft Office Graphics Component Remote Code Execution Vulnerability
High 8.8
In plain English
A high-severity stack buffer overflow in Microsoft Office 365 for Mac from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 42.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Office 365 for Mac | 1.0.0 – before 16.113.26091433 |
| Microsoft | Microsoft Office for Android | 16.0.1 – before 16.0.20430.20000 |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 – before 16.113.26091433 |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 – before 16.113.26091433 |
Weakness: CWE-121 · Vector: 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
References
- Microsoft Office Graphics Component Remote Code Execution Vulnerability vendor-advisory, patch