What is the CVSS score of EUVD-2026-78955?

EUVD-2026-78955 has a CVSS 3.1 base score of 6.7 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Google EUVD-2026-78955

| CVE-2026-56879 MEDIUM

Unintended Proxy or Intermediary ('Confused Deputy') (CWE-441)

2026-09-15 Google_Devices

GHSA-ffj5-38p8-49hw

Privilege Escalation Buffer Overflow Google

6.7

CVSS 3.1 · Vendor: Google_Devices

View

Vulnerability Assessment

Weakness

CWE

CWE-441

OWASP Top 10:2025

A01:2025 - Broken Access Control

ASVS 5.0

V4 - API and Web Service Proxy/intermediary controls

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.1% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Sep 15, 2026

Memory corruption in the Android kernel's GMC mailbox message handler (gmc_mb_msg_handler in gmc_mba.c) allows a local attacker who already holds System-level execution privileges to leverage a confused-deputy condition and escalate privileges on the device. The flaw is tracked as CWE-441 and rated CVSS 6.7 (AV:L/AC:L/PR:H/UI:N), meaning it is not remotely reachable and requires a high-privilege foothold rather than being an entry point; user interaction is not needed once that footing exists. Google Devices credited the report and fixed it in the September 2026 Pixel/Android security bulletin; no public exploit code or CISA KEV entry was identified at time of analysis.

Affected VersionsENISA

Android Android kernel

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Know when the next one hits your stack

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

Vendor (Google_Devices) PRIMARY 6.7 MEDIUM

AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (Google_Devices) · only source for this CVE.

CVSS VectorVendor: Google_Devices

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVSS changed

Sep 15, 2026 - 21:22 NVD

6.7 (MEDIUM)

CVE Published

Sep 15, 2026 - 18:33 cve.org

UNKNOWN (no severity yet)

CVE Published

Sep 15, 2026 - 18:33 cve.org

MEDIUM 6.7

DescriptionCVE.org

In gmc_mb_msg_handler of gmc_mba.c, there is a possible memory corruption due to a confused deputy. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.

Threat Intelligence Overview

EPSS Score

0.1%

Top 100% exploitable

Data Quality

4 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +34

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.