BaseFortify

Publication date: 2025-12-01

Last updated on: 2025-12-05

Assigner: Mattermost, Inc.

Description

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-01

Last Modified

2025-12-05

Generated

2026-07-06

AI Q&A

2025-12-01

EPSS Evaluated

2026-07-05

NVD

CVE-2025-12756

Affected Vendors & Products

Vendor	Product	Version / Range
mattermost	mattermost_server	From 10.5.0 (inc) to 10.5.13 (exc)
mattermost	mattermost_server	From 10.11.0 (inc) to 10.11.5 (exc)
mattermost	mattermost_server	From 10.12.0 (inc) to 10.12.2 (exc)
mattermost	mattermost_server	From 11.0.0 (inc) to 11.0.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability exists in certain versions of Mattermost where the system fails to properly check user permissions when deleting comments in Boards. Specifically, an authenticated user with the editor role can delete comments made by other users, which they should not be allowed to do.

Impact Analysis

The vulnerability allows users with editor permissions to delete comments created by others, potentially leading to unauthorized modification or removal of content. This can disrupt communication, cause loss of important information, and undermine trust in the integrity of the platform.

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