GHSA-xpvf-6qcc-9jqc

Suggest an improvement
Source
https://github.com/advisories/GHSA-xpvf-6qcc-9jqc
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-xpvf-6qcc-9jqc/GHSA-xpvf-6qcc-9jqc.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-xpvf-6qcc-9jqc
Aliases
Published
2026-03-16T15:30:46Z
Modified
2026-03-23T18:56:04Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Mattermost fails to validate team-specific upload_file permissions
Details

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to validate team-specific upload_file permissions which allows a guest user to post files in channels where they lack upload_file permission via uploading files in a team where they have permission and reusing the file metadata in a POST request to a different team. Mattermost Advisory ID: MMSA-2025-00553

Database specific 
{
    "cwe_ids": [
        "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-18T16:09:03Z",
    "nvd_published_at": "2026-03-16T14:20:19Z",
    "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
8.0.0-20260107144005-c7f6efdfb035

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-xpvf-6qcc-9jqc/GHSA-xpvf-6qcc-9jqc.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
5.3.2-0.20260107144005-c7f6efdfb035

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-xpvf-6qcc-9jqc/GHSA-xpvf-6qcc-9jqc.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-xpvf-6qcc-9jqc/GHSA-xpvf-6qcc-9jqc.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-xpvf-6qcc-9jqc/GHSA-xpvf-6qcc-9jqc.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-xpvf-6qcc-9jqc/GHSA-xpvf-6qcc-9jqc.json"