# CVE-2026-69343: Microsoft Windows Overlay Filter out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-69343-microsoft-windows-overlay-filter-out-of-bounds-read  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-69343 · Severity: medium · CVSS 5.5 · Published 2026-09-08

Windows Overlay Filter is a system component that manages visual overlays in the Windows operating system. An authorized attacker with local access could exploit an out-of-bounds read vulnerability to access sensitive information stored in system memory, potentially exposing credentials, encryption keys, or other confidential data.

Technologies: [Microsoft Windows Overlay Filter](https://junglewise.ai/threats/technologies/windows-overlay-filter). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-69343 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69343 being exploited in the wild.

**How severe is CVE-2026-69343?** Medium severity, with a CVSS score of 5.5, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Overlay Filter.

**Is there a fix for CVE-2026-69343?** 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-2026-69343 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-69343?** Check whether you run Microsoft Windows Overlay Filter. 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

This vulnerability is an out-of-bounds read in the Windows Overlay Filter component, allowing an authenticated local attacker to read memory beyond intended buffer boundaries. The attack requires local access and valid credentials on the target system. By exploiting this memory access flaw, an attacker can disclose sensitive information from kernel or process memory. The vulnerability is classified as medium severity with a CVSS score of 5.5, indicating moderate impact on confidentiality. A patch from Microsoft is expected to be available through the standard Windows Update process.

## Affected products

- Microsoft Windows Overlay Filter

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69343](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69343)

## Related threats

- [Windows Overlay Filter race condition privilege escalation](https://junglewise.ai/threats/cve-2026-121670-concurrent-execution-using-shared-resource-with-improper)
- [Microsoft Windows Overlay Filter race condition privilege escalation](https://junglewise.ai/threats/cve-2026-112813-concurrent-execution-using-shared-resource-with-improper)
- [Windows Overlay Filter integer overflow privilege escalation](https://junglewise.ai/threats/cve-2026-112760-integer-overflow-or-wraparound-in-windows-overlay-filter-allows)
- [Microsoft Windows Overlay Filter information disclosure](https://junglewise.ai/threats/cve-2026-108409-exposure-of-sensitive-system-information-to-an-unauthorized)
- [Windows Overlay Filter missing authorization](https://junglewise.ai/threats/cve-2026-96315-missing-authorization-in-windows-overlay-filter-allows-an)