GHSA-5mr9-crcg-8wh2

Suggest an improvement
Source
https://github.com/advisories/GHSA-5mr9-crcg-8wh2
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5mr9-crcg-8wh2/GHSA-5mr9-crcg-8wh2.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-5mr9-crcg-8wh2
Aliases
Published
2026-03-16T15:30:46Z
Modified
2026-03-23T18:56:15Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Mattermost fails to use consistent error responses when handling the /mute command
Details

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to use consistent error responses when handling the /mute command which allows an authenticated team member to enumerate private channels they are not authorized to know about via differing error messages for nonexistent versus private channels. Mattermost Advisory ID: MMSA-2026-00588

Database specific 
{
    "cwe_ids": [
        "CWE-203"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-18T16:08:43Z",
    "nvd_published_at": "2026-03-16T15:16:20Z",
    "severity": "MODERATE"
}
References

Affected packages

Go
github.com/mattermost/mattermost/server/v8

Package

Name
github.com/mattermost/mattermost/server/v8
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost/server/v8

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
8.0.0-20260130144323-5bb5261c72fa

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5mr9-crcg-8wh2/GHSA-5mr9-crcg-8wh2.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.3.2-0.20260130144323-5bb5261c72fa

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5mr9-crcg-8wh2/GHSA-5mr9-crcg-8wh2.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
10.11.0-rc1
Fixed
10.11.11

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5mr9-crcg-8wh2/GHSA-5mr9-crcg-8wh2.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
11.2.0-rc1
Fixed
11.2.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5mr9-crcg-8wh2/GHSA-5mr9-crcg-8wh2.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
11.3.0-rc1
Fixed
11.3.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5mr9-crcg-8wh2/GHSA-5mr9-crcg-8wh2.json"