# CVE-2026-88235: Microsoft Servicing Stack Updates privilege escalation

Source: https://junglewise.ai/threats/cve-2026-88235-unintended-proxy-or-intermediary-confused-deputy-in-servicing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-88235 · Severity: high · CVSS 7.8 · Published 2026-11-10

Microsoft's Servicing Stack Updates, a core Windows maintenance component, contains a confused deputy vulnerability that allows an authorized local user to elevate their privileges on the system. An attacker with user-level access could exploit this to gain administrator-level control, potentially compromising the entire Windows installation.

Technologies: [Microsoft Windows Servicing Stack Updates](https://junglewise.ai/threats/technologies/windows-servicing-stack-updates). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-88235 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88235 being exploited in the wild.

**How severe is CVE-2026-88235?** High severity, with a CVSS score of 7.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft Windows Servicing Stack Updates.

**Is there a fix for CVE-2026-88235?** 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-2026-88235 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-88235?** Check whether you run Microsoft Windows Servicing Stack Updates. 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

This is a confused deputy vulnerability in Windows Servicing Stack Updates where the component fails to properly validate the context or origin of requests, allowing privilege escalation. The vulnerability requires local access and an existing user account on the system; a remote network attack is not possible. An authenticated attacker can exploit this to execute code with SYSTEM privileges.

## Affected products

- Microsoft Windows Servicing Stack Updates

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88235](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88235)

## Related threats

- [Microsoft Servicing Stack Updates heap buffer overflow](https://junglewise.ai/threats/cve-2026-83863-heap-based-buffer-overflow-in-servicing-stack-updates-allows-an)
- [Microsoft Windows Servicing Stack Updates buffer over-read](https://junglewise.ai/threats/cve-2026-83719-buffer-over-read-in-servicing-stack-updates-allows-an-authorized)