CVE-2026-20957
HighSummary
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Risk Assessment
An attacker could take control of the user's system if the user opens a malicious Excel file.
Recommendation
Install the latest security updates for Microsoft Office Excel.
Other vulnerabilities in Microsoft Office Excel
See all- CVE-2026-40360High
An out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
- CVE-2026-40359High
A use after free vulnerability in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
- CVE-2026-20956High
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
- CVE-2026-20955High
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
- CVE-2026-20950High
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
- CVE-2026-20949High
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
- CVE-2026-20946High
An out-of-bounds read vulnerability in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
- CVE-2026-70328Medium
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
- CVE-2026-70327Medium
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
- CVE-2026-70318Medium
Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Original NVD description (English source)
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.