CVE-2025-55073

MEDIUM

Mattermost <10.11.3, 10.5.11, 10.12.0 - Open Redirect

Title source: llm

Description

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

References (1)

Core 1

Core References

Vendor Advisory

https://mattermost.com/security-updates

Scores

CVSS v3 5.4

EPSS 0.0004

EPSS Percentile 14.0%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-306

Status published

Products (3)

mattermost/mattermost 0 - 8.0.0-20250929212932-a41db04d2746Go

mattermost/mattermost-server 10.11.0 - 10.11.4Go

mattermost/mattermost_server 10.5.0 - 10.5.12

Published Nov 14, 2025

Tracked Since Feb 18, 2026