Mattermost has a Missing Authorization vulnerability

CVE-2025-41443 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the /api/v4/teams/{team_id}/channels/ids endpoint

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
—
Source code
Browse source ↗
Published (advisory)
2025-10-16 09:30:24 UTC
Updated
2025-10-16 20:54:55 UTC
GitHub reviewed
2025-10-16 20:54:54 UTC
NVD published
2025-10-16

EPSS Score

Score Percentile
0.01% 1.29%

CVSS Scores

Base score Version Severity Vector
4.3 3.1 —
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-7cr3-38jm-6p45 ↗
CVE CVE-2025-41443 ↗

CWEs

CWE id Name
CWE-862 Missing Authorization

Affected packages (3)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
go github.com/mattermost/mattermost/server/v8 < 8.0.0-20250822090405-e8c7e7d0252b 8.0.0-20250822090405-e8c7e7d0252b —
go github.com/mattermost/mattermost-server >= 10.5.0, < 10.5.11 10.5.11 —
go github.com/mattermost/mattermost-server >= 10.11.0, < 10.11.3 10.11.3 —

References

cvelogic Threat Intelligence