CVE-2026-55948
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
A Use-After-Free vulnerability in Microsoft Office Excel allows an unauthorized attacker to execute code locally. The issue stems from improper memory management when processing specially crafted Excel files.
Risk Assessment
An attacker can take control of the victim's system by executing malicious code in the context of the logged-in user. This could lead to data theft, malware installation, or further propagation of the attack within the network.
Recommendation
Apply the security update provided by Microsoft for Microsoft Office Excel immediately. Additionally, implement policies to restrict opening Excel files from untrusted sources.
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-2026-20957High
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-2026-70328Medium
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.
Original NVD description (English source)
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.