What is CVE-2026-20483?

CVE-2026-20483 is a high-severity vulnerability in Mediatek Mt6739 Firmware, classified under Missing Authorization. CVSS score: 7.7/10. Published 2026-08-03.

How severe is CVE-2026-20483?

High severity. CVSS v3 base score is 7.7 out of 10.

Auth bypass in Mediatek Mt6739 Firmware

CVE-2026-20483

In Telephony, there is a possible escalation of privilege due to a missing permission check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11087526; Issue ID: MSV-8243.

Vulnerability class: Broken Access Control

EPSS: 0.001 (2.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Mediatek Mt6739_firmware
Mediatek Mt6761_firmware
Mediatek Mt6765_firmware
Mediatek Mt6768_firmware
Mediatek Mt6781_firmware
Mediatek Mt6789_firmware
Mediatek Mt6833_firmware
Mediatek Mt6835_firmware
Mediatek Mt6853_firmware
Mediatek Mt6855_firmware

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20483?: CVE-2026-20483 is a high-severity vulnerability in Mediatek Mt6739 Firmware, classified under Missing Authorization. CVSS score: 7.7/10. Published 2026-08-03.
How severe is CVE-2026-20483?: High severity. CVSS v3 base score is 7.7 out of 10.