CVE-2025-11776

MEDIUM

Mattermost < 11.0.0 - Unauthenticated Archived Channel Discovery via Search API

Title source: llm

Description

Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint

References (1)

Core 1

Core References

Vendor Advisory

https://mattermost.com/security-updates

Scores

CVSS v3 4.3

EPSS 0.0004

EPSS Percentile 11.8%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-863

Status published

Products (4)

mattermost/mattermost 0 - 5.3.2-0.20250815165020-c8d66301415dGo

mattermost/mattermost 0 - 8.0.0-20250815165020-c8d66301415dGo

mattermost/mattermost-server 0 - 5.3.2-0.20250815165020-c8d66301415d (3 CPE variants)Go

mattermost/mattermost_server < 11.0.0

Published Nov 14, 2025

Tracked Since Feb 18, 2026