CVE-2025-8402 | BDVDB-2026-290635 Detail

MattermostMattermost

Description#

Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to validate import data which allows a system admin to crash the server via the bulk import feature.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-1287 Improper Validation of Specified Type of Input
CWE-476 NULL Pointer Dereference

References#

https://mattermost.com/security-updates

Exploit#

No public exploit known

History#

Version 12025-08-21Record published in the CVE List.

Published

Published: 2025-08-21
Last modified: 2025-08-21

Vendor information

Vendor: Mattermost
Product: Mattermost

All Mattermost vulnerabilities

Score

4.9 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 25.3.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 10.8.0 and <= 10.8.3
Fixed
Not stated
Vulnerable
>= 10.5.0 and <= 10.5.8
Fixed
Not stated
Vulnerable
>= 9.11.0 and <= 9.11.17
Fixed
Not stated
Vulnerable
10.10.0
Fixed
Not stated
Vulnerable
>= 10.9.0 and <= 10.9.3
Fixed
Not stated
Vulnerable
Not stated
Fixed
10.11.0
Vulnerable
Not stated
Fixed
10.8.4
Vulnerable
Not stated
Fixed
10.5.9

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.9 Medium

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	High
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).