CVE-2026-55053
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
A heap-based buffer overflow vulnerability in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Risk Assessment
An attacker can exploit this vulnerability to take control of the victim's system, leading to data theft, malware installation, or further privilege escalation.
Recommendation
Apply the security update provided by Microsoft for Excel immediately and consider implementing policies to restrict macro execution and opening untrusted files.
Other vulnerabilities in Microsoft Office Excel
See all- CVE-2026-20957High
Integer underflow (wrap or wraparound) 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-2026-108446High
A use-after-free vulnerability in Microsoft Office Excel allows an unauthenticated attacker to execute code over a network. The vulnerability occurs when processing specially crafted data.
- CVE-2026-97780High
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
- CVE-2026-97779Medium
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network. The attacker can read data outside the intended memory bounds.
- CVE-2026-97778High
Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Original NVD description (English source)
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS