CVE-2026-70257: microsoft 365_apps, microsoft office_2021, microsoft office_2024

CVSS 8.8 (high) · published 2026-10-13

Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

Affected products (NVD): microsoft 365_apps, microsoft office_2021, microsoft office_2024

Weakness: CWE-122, CWE-190

Source: NVD CVE-2026-70257

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70257

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.