CVE-2026-20470

MediaTek Telephony Permission Check Failure Leading to Local Information Disclosure

Published Aug 3, 2026 CVSS 3.1 · 6.2 Medium EPSS < 1% KEV · Not listed

Description

In Telephony, there is a possible information disclosure due to a missing permission check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11086431; Issue ID: MSV-8189.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

MediaTek, Inc.

MediaTek chipset

unaffected

Version	Status	Constraints
`MT6739`	affected	—
`MT6761`	affected	—
`MT6765`	affected	—
`MT6768`	affected	—
`MT6769`	affected	—
`MT6771`	affected	—
`MT6779`	affected	—
`MT6781`	affected	—
`MT6785`	affected	—
`MT6789`	affected	—
`MT6833`	affected	—
`MT6835`	affected	—
`MT6853`	affected	—
`MT6855`	affected	—
`MT6858`	affected	—
`MT6873`	affected	—
`MT6877`	affected	—
`MT6878`	affected	—
`MT6879`	affected	—
`MT6881`	affected	—
`MT6883`	affected	—
`MT6885`	affected	—
`MT6886`	affected	—
`MT6889`	affected	—
`MT6893`	affected	—
`MT6895`	affected	—
`MT6897`	affected	—
`MT6899`	affected	—
`MT6953`	affected	—
`MT6983`	affected	—
`MT6985`	affected	—
`MT6989`	affected	—
`MT6991`	affected	—
`MT6993`	affected	—
`MT6995`	affected	—
`MT8668`	affected	—
`MT8676`	affected	—
`MT8678`	affected	—
`MT8755`	affected	—
`MT8765`	affected	—
`MT8766`	affected	—
`MT8766R`	affected	—
`MT8768`	affected	—
`MT8775`	affected	—
`MT8781`	affected	—
`MT8792`	affected	—
`MT8796`	affected	—
`MT8798`	affected	—
`MT8863`	affected	—
`MT8873`	affected	—
`MT8883`	affected	—
`MT8893`	affected	—

No data.

Vendor Product Versions

Mediatek, Inc.

Mediatek Chipset

Version	Status	Scheme	Platform
`MT6739`	affected	generic	—
`MT6761`	affected	generic	—
`MT6765`	affected	generic	—
`MT6768`	affected	generic	—
`MT6781`	affected	generic	—
`MT6789`	affected	generic	—
`MT6835`	affected	generic	—
`MT6853`	affected	generic	—
`MT6855`	affected	generic	—
`MT6877`	affected	generic	—
`MT6878`	affected	generic	—
`MT6879`	affected	generic	—
`MT6883`	affected	generic	—
`MT6885`	affected	generic	—
`MT6886`	affected	generic	—
`MT6889`	affected	generic	—
`MT6893`	affected	generic	—
`MT6895`	affected	generic	—
`MT6897`	affected	generic	—
`MT6899`	affected	generic	—
`MT6983`	affected	generic	—
`MT6985`	affected	generic	—
`MT6989`	affected	generic	—
`MT6991`	affected	generic	—
`MT6993`	affected	generic	—
`MT8668`	affected	generic	—
`MT8676`	affected	generic	—
`MT8678`	affected	generic	—
`MT8755`	affected	generic	—
`MT8765`	affected	generic	—
`MT8766`	affected	generic	—
`MT8766R`	affected	generic	—
`MT8768`	affected	generic	—
`MT8775`	affected	generic	—
`MT8781`	affected	generic	—
`MT8792`	affected	generic	—
`MT8796`	affected	generic	—
`MT8798`	affected	generic	—
`MT8863`	affected	generic	—
`MT8873`	affected	generic	—
`MT8883`	affected	generic	—
`MT8893`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.171% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://www.mediatek.com/product-security-bulletin/August-2026

History

Aug 4, 2026 10:15 PM Title updated View changes

Type	Values Removed	Values Added
Title		MediaTek Telephony Permission Check Failure Leading to Local Information Disclosure

Aug 3, 2026 9:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Aug 3, 2026 3:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Mediatek, Inc. Mediatek, Inc. mediatek Chipset
Vendors & Products		Mediatek, Inc. Mediatek, Inc. mediatek Chipset

Aug 3, 2026 2:45 AM Description updated. Weaknesses updated. Added references View changes

Type	Values Removed	Values Added
Description		In Telephony, there is a possible information disclosure due to a missing permission check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11086431; Issue ID: MSV-8189.
Weaknesses		CWE-926
References		https://www.mediatek.com/product-security-bulletin/August-2026