Microsoft WebP Image Extension < 1.2.31.0 RCE (CVE-2026-70351) (September 2026)

high Nessus Plugin ID 346896

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Synopsis

The Microsoft WebP Image Extension app installed on the remote host is affected by a remote code execution vulnerability.

Description

The version of the Microsoft WebP Image Extension app installed on the remote Windows host is prior to 1.2.31.0. It is, therefore, affected by a remote code execution vulnerability:

- Integer overflow or wraparound in Microsoft WebP Image Extension allows an unauthorized attacker to execute code over a network. (CVE-2026-70351)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the Microsoft WebP Image Extension app to version 1.2.31.0 or later via the Microsoft Store.

Plugin Details

Severity: High

ID: 346896

File Name: microsoft_webp_image_extension_CVE-2026-70351.nasl

Version: 1.2

Type: Local

Agent: windows

Family: Windows

Published: 9/17/2026

Updated: 9/18/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.15

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-70351

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:webp_image_extension

Required KB Items: installed_sw/Microsoft.WebpImageExtension

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-70351

Detections

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