# CVE-2026-42971: Microsoft Windows Push Notifications information disclosure

Source: https://junglewise.ai/threats/cve-2026-42971-microsoft-windows-push-notifications-information-disclosure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-42971 · Severity: medium · CVSS 5.5 · Published 2026-06-09

A security vulnerability exists in the Windows Push Notification service, which handles the delivery of alerts and updates to applications. An attacker who already has basic access to a computer could exploit this flaw to view sensitive information that they should not be able to see. This could lead to the exposure of private data or system details, though it cannot be used to take over the computer or crash the system directly.

Technologies: [Microsoft Windows Push Notifications](https://junglewise.ai/threats/technologies/windows-push-notifications). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-42971 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42971 being exploited in the wild.

**How severe is CVE-2026-42971?** Medium severity, with a CVSS score of 5.5, published 9 June 2026.

**Which products and versions are affected?** Microsoft Windows Push Notifications.

**Is there a fix for CVE-2026-42971?** 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-2026-42971 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-42971?** Check whether you run Microsoft Windows Push Notifications. 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 vulnerability classified as CWE-200 (Exposure of Sensitive Information) exists in the Windows Push Notification component due to the use of an uninitialized resource. An attacker with local access and low privileges can exploit this flaw without any user interaction. By triggering the vulnerability, the attacker can read data from memory that was not properly cleared, potentially leading to the disclosure of sensitive system or user information. Microsoft has released security updates to address this issue, and the exploit is currently limited to local information disclosure (Confidentiality: High) without impacting Integrity or Availability.

## Affected products

- Microsoft Windows Push Notifications

## Timeline

- 2026-06-09: disclosed
- 2026-06-09: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42971](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42971)

## Related threats

- [Microsoft Windows Push Notifications use after free privilege escalation](https://junglewise.ai/threats/cve-2026-70198-use-after-free-in-windows-push-notifications-allows-an-authorized)
- [Microsoft Windows Push Notifications privilege escalation](https://junglewise.ai/threats/cve-2026-69300-microsoft-windows-push-notifications-privilege-escalation)
- [Microsoft Windows Push Notifications privilege escalation via race condition](https://junglewise.ai/threats/cve-2026-42991-microsoft-windows-push-notifications-privilege-escalation-via)
- [Microsoft Windows Push Notifications race condition privilege escalation](https://junglewise.ai/threats/cve-2026-42979-microsoft-windows-push-notifications-race-condition-privilege)
- [Microsoft Windows Push Notifications race condition privilege escalation](https://junglewise.ai/threats/cve-2026-42977-microsoft-windows-push-notifications-race-condition-privilege)