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

Source: https://junglewise.ai/threats/cve-2026-69966-integer-overflow-or-wraparound-in-microsoft-streaming-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

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](https://junglewise.ai/threats/technologies/streaming-service). Vendors: [Microsoft](https://junglewise.ai/threats/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

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69966](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69966)

## Related threats

- [Microsoft Streaming Service heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-119937-heap-based-buffer-overflow-in-microsoft-streaming-service-allows)
- [Microsoft Streaming Service heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-69970-heap-based-buffer-overflow-in-microsoft-streaming-service-allows)
- [Microsoft Streaming Service use after free privilege escalation](https://junglewise.ai/threats/cve-2026-69964-use-after-free-in-microsoft-streaming-service-allows-an)
- [Microsoft Streaming Service heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-69963-heap-based-buffer-overflow-in-microsoft-streaming-service-allows)
- [Microsoft Streaming Service Untrusted Pointer Dereference Vulnerability](https://junglewise.ai/threats/cve-2023-29360-microsoft-streaming-service-untrusted-pointer-dereference)