Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-4339

Severity CVSS v4.0:
Pending analysis
Type:
CWE-918 Server-Side Request Forgery (SSRF)
Publication date:
26/06/2026
Last modified:
29/06/2026

Description

Mattermost versions 10.11.x

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): None
Availability (A): None

Base Score 3.x
6.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* 10.11.0 (including) 10.11.19 (excluding)
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* 11.5.0 (including) 11.5.7 (excluding)
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* 11.6.0 (including) 11.6.4 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools