# CVE-2026-78455: Microsoft Xbox out-of-bounds read in hardware interface

Source: https://junglewise.ai/threats/cve-2026-78455-microsoft-xbox-out-of-bounds-read-in-hardware-interface  
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-2026-78455 · Severity: medium · CVSS 4.3 · Published 2026-09-08

Xbox gaming consoles contain a vulnerability in hardware interface handling that allows a physically present attacker to read sensitive information from the device's memory. An attacker with direct access to the console could potentially extract authentication credentials, user data, or other confidential information stored on the device.

Technologies: [Microsoft Xbox](https://junglewise.ai/threats/technologies/xbox). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-78455 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78455 being exploited in the wild.

**How severe is CVE-2026-78455?** Medium severity, with a CVSS score of 4.3, published 8 September 2026.

**Which products and versions are affected?** Microsoft Xbox.

**Is there a fix for CVE-2026-78455?** 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-2026-78455 attacked?** It is attacked with physical access, in a network appliance.

**Am I affected by CVE-2026-78455?** Check whether you run Microsoft Xbox. 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 out-of-bounds read vulnerability exists in Xbox hardware interface handling. The vulnerability requires physical access to the device, meaning an attacker must have hands-on access to exploit it. The flaw allows reading memory locations beyond intended boundaries, potentially disclosing sensitive data including credentials, keys, or user information. Physical attack preconditions limit the practical attack surface, but could be relevant in scenarios involving device theft or insider threats.

## Affected products

- Microsoft Xbox

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78455](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78455)

## Related threats

- [Microsoft Xbox heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-95874-heap-based-buffer-overflow-in-xbox-allows-an-authorized-attacker)
- [Microsoft Xbox heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-66801-heap-based-buffer-overflow-in-xbox-allows-an-unauthorized)