# CVE-2026-69471: Windows Installer heap-based buffer overflow privilege elevation

Source: https://junglewise.ai/threats/cve-2026-69471-heap-based-buffer-overflow-in-windows-installer-allows-an  
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-2026-69471 · Severity: high · CVSS 7.8 · Published 2026-10-13

Windows Installer, a core component that manages software installation on Windows systems, contains a heap buffer overflow vulnerability. An authorized local user can exploit this flaw to gain elevated privileges and take full control of the system. This could be used to install malware, steal data, or compromise system integrity.

Technologies: [Microsoft Windows Installer](https://junglewise.ai/threats/technologies/windows-installer). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-69471 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69471 being exploited in the wild.

**How severe is CVE-2026-69471?** High severity, with a CVSS score of 7.8, published 13 October 2026.

**Which products and versions are affected?** Microsoft Windows Installer.

**Is there a fix for CVE-2026-69471?** 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-2026-69471 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-69471?** Check whether you run Microsoft Windows Installer. 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 heap-based buffer overflow exists in Windows Installer that allows local privilege escalation. The vulnerability requires an authenticated attacker with local access; exploitation overwrites heap memory to achieve code execution with elevated privileges. Microsoft has released security updates to patch this vulnerability.

## Affected products

- Microsoft Windows Installer

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69471](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69471)

## Related threats

- [Microsoft Windows Installer stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-96152-stack-based-buffer-overflow-in-windows-installer-allows-an)
- [Windows Installer heap-based buffer overflow allows privilege elevation](https://junglewise.ai/threats/cve-2026-96085-heap-based-buffer-overflow-in-windows-installer-allows-an)
- [Microsoft Windows Installer heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-96062-heap-based-buffer-overflow-in-windows-installer-allows-an)
- [Windows Installer use-after-free privilege elevation](https://junglewise.ai/threats/cve-2026-96061-use-after-free-in-windows-installer-allows-an-authorized-attacker)
- [Windows Installer out-of-bounds read privilege escalation](https://junglewise.ai/threats/cve-2026-96060-out-of-bounds-read-in-windows-installer-allows-an-authorized)