GHSA-ffpr-pfr4-g354

Suggest an improvement
Source
https://github.com/advisories/GHSA-ffpr-pfr4-g354
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ffpr-pfr4-g354/GHSA-ffpr-pfr4-g354.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-ffpr-pfr4-g354
Aliases
  • CVE-2026-3636
Published
2026-05-26T13:30:15Z
Modified
2026-06-26T23:00:16.838257426Z
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 doesn't sanitize team member data when returned via API to users without elevated permissions
Details

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to sanitize team member data when returned via API to users without elevated permissions which allows a user without permissions to get data about team members roles via invoking various team API endpoints. Mattermost Advisory ID: MMSA-2026-00626.

Database specific 
{
    "nvd_published_at": "2026-05-22T11:16:22Z",
    "cwe_ids": [
        "CWE-200"
    ],
    "github_reviewed": true,
    "severity": "MODERATE",
    "github_reviewed_at": "2026-06-26T22:47:59Z"
}
References

Affected packages

Go
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
11.6.0
Fixed
11.6.1

Affected versions

11.*
11.6.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ffpr-pfr4-g354/GHSA-ffpr-pfr4-g354.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
11.5.0
Fixed
11.5.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ffpr-pfr4-g354/GHSA-ffpr-pfr4-g354.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
11.4.0
Fixed
11.4.5

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ffpr-pfr4-g354/GHSA-ffpr-pfr4-g354.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
Fixed
10.11.15

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ffpr-pfr4-g354/GHSA-ffpr-pfr4-g354.json"