CVE-2026-4858

Severity CVSS v4.0:

Pending analysis

Type:

CWE-22 Path Traversal

Publication date:

21/05/2026

Last modified:

21/05/2026

Description

Mattermost versions 11.6.x

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.00 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): Required
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

8.00

Severity 3.x

HIGH

References to Advisories, Solutions, and Tools

https://mattermost.com/security-updates