# CVE-2026-83767: Windows Installer stack-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-83767-stack-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-2026-83767 · Severity: high · CVSS 7.8 · Published 2026-10-13

Windows Installer, a core Windows component that handles software installation, contains a buffer overflow vulnerability that could allow an authorized attacker to gain elevated privileges on the system. An attacker with existing access could exploit this flaw to gain administrative control, potentially enabling further malicious activity on the affected machine.

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

## Quick answers

**Is CVE-2026-83767 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83767 being exploited in the wild.

**How severe is CVE-2026-83767?** 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-2026-83767?** 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-2026-83767 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-83767?** 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 stack-based buffer overflow exists in Windows Installer that can be exploited by an authorized attacker to achieve local privilege escalation. The vulnerability requires prior authentication or local system access to trigger. Successful exploitation grants the attacker elevated privileges on the compromised system.

## Affected products

- Microsoft Windows Installer

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83767](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83767)

## 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)