Quick answers
- Is CVE-2026-83779 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83779 being exploited in the wild.
- How severe is CVE-2026-83779?
- 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-2026-83779?
- 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-2026-83779 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-83779?
- 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 in Windows Installer allows privilege escalation when an authorized attacker provides malformed input to the installer. The vulnerability requires local access and existing authentication context but can result in elevation to SYSTEM privileges. No workaround details are provided in the advisory.
Affected products
- Microsoft Windows Installer
Timeline
- 2026-10-13: disclosed