Quick answers
- Is CVE-2026-83578 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83578 being exploited in the wild.
- How severe is CVE-2026-83578?
- Critical severity, with a CVSS score of 9.8, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Windows PowerShell.
- Is there a fix for CVE-2026-83578?
- 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-2026-83578 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-83578?
- Check whether you run Microsoft Windows PowerShell. 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
An integer underflow (wraparound) vulnerability in Windows PowerShell allows remote code execution. The flaw permits unauthenticated network-based exploitation, meaning an attacker can trigger the vulnerability without credentials or user interaction and gain code execution with the privileges of the PowerShell process.
Affected products
- Microsoft Windows PowerShell
Timeline
- 2026-10-13: disclosed