Vulnerability · Published May 12, 2026 · Assigned by microsoft
CVE-2026-42831Microsoft Office Remote Code Execution Vulnerability
High 7.8
In plain English
A high-severity heap buffer overflow in Microsoft Office for Android from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.4%top 61.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Office for Android | 16.0.1 – before 16.0.19822.20190 |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 – before 16.109.26051019 |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 – before 16.109.26051019 |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Microsoft Office Remote Code Execution Vulnerability vendor-advisory, patch