---
id: CVE-2023-6459
aliases:
  - GHSA-63cv-4pc2-4fcf
  - BIT-mattermost-2023-6459
title: >-
  Mattermost Exposure of Sensitive Information to an Unauthorized Actor
  vulnerability
summary: >-
  Mattermost Exposure of Sensitive Information to an Unauthorized Actor
  vulnerability
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
vendor: mattermost
product: github.com/mattermost/mattermost-server/v6
ecosystem: go
affected:
  - github.com/mattermost/mattermost-server/v6 < 7.8.14
  - github.com/mattermost/mattermost/server/v8 < 8.1.5
patched:
  - github.com/mattermost/mattermost-server/v6 7.8.14
  - github.com/mattermost/mattermost/server/v8 8.1.5
published: '2023-12-06'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:59.493388426Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-63cv-4pc2-4fcf'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-6459'
  - url: 'https://github.com/mattermost/mattermost'
  - url: 'https://mattermost.com/security-updates'
tags:
  - osv
  - go
epss: 0.00534
epssPercentile: 0.4258
ingestedAt: '2026-09-12T03:13:01.757Z'
---

## Overview

Mattermost is grouping calls in the /metrics endpoint by id and reports that id in the response. Since this id is the channelID, the public /metrics endpoint is revealing channelIDs.



## Affected packages

- `github.com/mattermost/mattermost-server/v6 < 7.8.14`
- `github.com/mattermost/mattermost/server/v8 < 8.1.5`

## Remediation

Upgrade to a patched release:

- `github.com/mattermost/mattermost-server/v6 7.8.14`
- `github.com/mattermost/mattermost/server/v8 8.1.5`