CVE-2025-9084

LOW

Mattermost <10.5.9 - Open Redirect

Title source: llm

Description

Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs

References (1)

[Vendor Advisory] https://mattermost.com/security-updates

Scores

CVSS v3 3.1

EPSS 0.0003

EPSS Percentile 8.2%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-601

Status published

Products (3)

mattermost/mattermost 0 - 8.0.0-202508080704-39bd251fe4f600Go

mattermost/mattermost-server 10.5.0 - 10.5.10Go

mattermost/mattermost_server 10.5.0 - 10.5.10

Published Sep 15, 2025

Tracked Since Feb 18, 2026