CVE-2026-124227: Microsoft Office Outlook use of uninitialized resource code execution

CVE-2026-124227 · Severity: high · CVSS 7.5 · Published 2026-11-10

Microsoft Office Outlook contains a use of uninitialized resource vulnerability that allows an attacker to execute code over a network. This could lead to unauthorized code execution on a user's computer, potentially allowing an attacker to steal data, install malware, or compromise the system.

Technologies: Microsoft Office Outlook. Vendors: Microsoft.

Quick answers

Is CVE-2026-124227 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-124227 being exploited in the wild.
How severe is CVE-2026-124227?
High severity, with a CVSS score of 7.5, published 10 November 2026.
Which products and versions are affected?
Microsoft Office Outlook.
Is there a fix for CVE-2026-124227?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-124227 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-124227?
Check whether you run Microsoft Office Outlook. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A use of uninitialized resource vulnerability in Microsoft Office Outlook permits network-based code execution. The vulnerability is triggered when a user interacts with specially crafted content, allowing an attacker to execute arbitrary code with the privileges of the affected user.

Affected products

  • Microsoft Office Outlook

Timeline

  • 2026-11-10: disclosed

References

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