# CVE-2026-119867: Windows Installer cryptographic signature verification bypass

Source: https://junglewise.ai/threats/cve-2026-119867-improper-verification-of-cryptographic-signature-in-windows  
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-2026-119867 · Severity: medium · CVSS 5.3 · Published 2026-11-10

Windows Installer, the system component responsible for software installation on Windows systems, does not properly validate digital signatures on installation packages. An attacker could exploit this over the network to bypass signature verification and potentially install unauthorized or malicious software on a system.

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

## Quick answers

**Is CVE-2026-119867 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119867 being exploited in the wild.

**How severe is CVE-2026-119867?** Medium severity, with a CVSS score of 5.3, published 10 November 2026.

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

**Is there a fix for CVE-2026-119867?** 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-2026-119867 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-119867?** 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

The vulnerability is an improper verification of cryptographic signatures in Windows Installer, allowing signature validation to be bypassed via network-accessible attack vectors. An attacker can leverage this to bypass the security feature that ensures installation packages have been properly signed and authorized, though the advisory does not specify whether user interaction or additional preconditions are required.

## Affected products

- Microsoft Windows Installer

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119867](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119867)

## 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)