CVE-2026-97766
8.8HighPublished 13 Oct 2026 · NVD status: Analyzed · AI triage by gemini-3.8-flash
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
- Impact
- Full C/I/A compromise
- Weakness
- CWE-122
Impact
Remote attackers can execute arbitrary code with the privileges of the local user if a victim opens a crafted Excel file. Network delivery is possible, but user interaction is required.
Root cause
A heap-based buffer overflow flaw exists during the parsing of malformed files in Microsoft Office Excel.
Affected systems
Versions not listed — check the vendor advisory.
CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Fix & remediation
Install the security update released in the Microsoft Security Response Center advisory for CVE-2026-97766. As an interim workaround, block inbound email attachments or downloads containing untrusted Excel documents and use Protected View.
AI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD description
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97766PatchVendor Advisory