# CVE-2026-83840: Windows Error Reporting weak authentication privilege escalation

Source: https://junglewise.ai/threats/cve-2026-83840-weak-authentication-in-windows-error-reporting-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-2026-83840 · Severity: high · CVSS 7.8 · Published 2026-10-13

Windows Error Reporting, a system component that collects and reports application crashes, contains a weak authentication vulnerability that allows authorized users to escalate their privileges on a local system. An attacker with local access could exploit this flaw to gain higher-level access and compromise system integrity or steal sensitive data.

Technologies: [Microsoft Windows Error Reporting](https://junglewise.ai/threats/technologies/windows-error-reporting). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-83840 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83840 being exploited in the wild.

**How severe is CVE-2026-83840?** High severity, with a CVSS score of 7.8, published 13 October 2026.

**Which products and versions are affected?** Microsoft Windows Error Reporting <UNKNOWN>.

**Is there a fix for CVE-2026-83840?** 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-2026-83840 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-83840?** Check whether you run Microsoft Windows Error Reporting at an affected version. 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 exists in Windows Error Reporting's authentication mechanism, allowing an authorized (local) attacker to escalate privileges through inadequate access controls. The attack requires local access and existing user credentials. Exploitation results in privilege escalation on the target system, and a fix is available from Microsoft.

## Affected products

- Microsoft Windows Error Reporting <UNKNOWN>

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83840](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83840)

## Related threats

- [Windows Error Reporting privilege escalation in file handling](https://junglewise.ai/threats/cve-2026-94525-an-elevation-of-privilege-vulnerability-exists-in-windows-error)
- [Windows Error Reporting double free privilege escalation](https://junglewise.ai/threats/cve-2026-85862-double-free-in-windows-error-reporting-allows-an-authorized)
- [Windows Error Reporting use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-85354-use-after-free-in-windows-error-reporting-allows-an-authorized)
- [Microsoft Windows Error Reporting out-of-bounds read](https://junglewise.ai/threats/cve-2026-83747-out-of-bounds-read-in-windows-error-reporting-allows-an)
- [Windows Error Reporting privilege escalation](https://junglewise.ai/threats/cve-2026-83669-use-of-uninitialized-resource-in-windows-error-reporting-allows)