# CVE-2026-20495: MediaTek Bluetooth driver permission bypass

Source: https://junglewise.ai/threats/cve-2026-20495-mediatek-bluetooth-driver-permission-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-03. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-20495 · Severity: high · CVSS 7.8 · Published 2026-08-03

MediaTek's Bluetooth driver, used in mobile and IoT devices, contains a missing permission check that allows a local user to escalate their privileges without requiring any user interaction. An attacker with basic user-level access could exploit this flaw to gain elevated system permissions, potentially compromising device security and enabling further attacks.

Technologies: [MediaTek Mt7902](https://junglewise.ai/threats/technologies/mt7902), [MediaTek Mt7920](https://junglewise.ai/threats/technologies/mt7920), [MediaTek Mt7921](https://junglewise.ai/threats/technologies/mt7921), [MediaTek Mt7922](https://junglewise.ai/threats/technologies/mt7922), [MediaTek Mt7925](https://junglewise.ai/threats/technologies/mt7925), [MediaTek Mt7927](https://junglewise.ai/threats/technologies/mt7927). Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## Quick answers

**Is CVE-2026-20495 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20495 being exploited in the wild.

**How severe is CVE-2026-20495?** High severity, with a CVSS score of 7.8, published 3 August 2026.

**Which products and versions are affected?** MediaTek Bluetooth driver.

**Is there a fix for CVE-2026-20495?** 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-2026-20495 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-20495?** Check whether you run MediaTek Bluetooth driver, MediaTek Mt7902, MediaTek Mt7902 Firmware or one of the others listed. 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 is a missing permission check in the MediaTek Bluetooth driver, classified as an authorization bypass. An attacker with local user-level execution privileges can exploit this flaw without requiring user interaction or network access. By bypassing the permission check, an attacker achieves privilege escalation from user to a higher privilege level. The patch ID WCNCR00488300 has been provided, and MediaTek has notified device OEMs of the fix for at least two months before public disclosure.

## Affected products

- MediaTek Bluetooth driver

## Timeline

- 2026-08-03: disclosed
- 2026-08-03: advisory: MediaTek Product Security Bulletin August 2026

## References

- [https://www.mediatek.com/product-security-bulletin/August-2026](https://www.mediatek.com/product-security-bulletin/August-2026)

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