CVE-2026-69966: Microsoft Streaming Service integer overflow privilege escalation

CVE-2026-69966 · Severity: high · CVSS 7.8 · Published 2026-10-13

Microsoft Streaming Service contains an integer overflow vulnerability that allows an authenticated attacker with local access to elevate their privileges on a system. An attacker exploiting this flaw could gain administrative control of the affected computer, leading to data theft, malware installation, or system compromise.

Technologies: Microsoft Streaming Service. Vendors: Microsoft.

Quick answers

Is CVE-2026-69966 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-69966 being exploited in the wild.
How severe is CVE-2026-69966?
High severity, with a CVSS score of 7.8, published 13 October 2026.
Which products and versions are affected?
Microsoft Streaming Service.
Is there a fix for CVE-2026-69966?
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-2026-69966 attacked?
It is attacked with local access, in a hosted service.
Am I affected by CVE-2026-69966?
Check whether you run Microsoft Streaming Service. 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

An integer overflow or wraparound condition exists in Microsoft Streaming Service, allowing a local authenticated attacker to escalate privileges. The vulnerability requires local access and existing user credentials but does not require user interaction. Successful exploitation grants elevated system privileges.

Affected products

  • Microsoft Streaming Service

Timeline

  • 2026-10-13: disclosed

References

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