---
title: "CVE-2026-96185: Microsoft Exchange Online - Buffer Overflow"
description: "Microsoft Exchange Online contains a stack-based buffer overflow caused by improper handling of input, letting authorized attackers execute code remotely over a network, exploit requires attacker authorization."
url: https://panop.io/threat-heartbeat/CVE-2026-96185/
---

# CVE-2026-96185 Microsoft Exchange Online - Buffer Overflow

Microsoft Exchange Online contains a stack-based buffer overflow caused by improper handling of input, letting authorized attackers execute code remotely over a network, exploit requires attacker authorization.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-96185)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest version of Microsoft Exchange Online.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-96185](https://nvd.nist.gov/vuln/detail/CVE-2026-96185)
- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96185](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96185)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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