GHSA-r5vf-grcx-5vqp

Suggest an improvement
Source
https://github.com/advisories/GHSA-r5vf-grcx-5vqp
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-r5vf-grcx-5vqp/GHSA-r5vf-grcx-5vqp.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-r5vf-grcx-5vqp
Aliases
Published
2026-05-26T13:30:19Z
Modified
2026-07-07T16:11:04Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Mattermost allows authenticated users to gain access to private repositories
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 validate the OAuth token scope on the callback which allows an authenticated Mattermost user to gain access to private repositories via modifying the scope parameter in the GitHub authorization URL. Mattermost Advisory ID: MMSA-2026-00628

Database specific 
{
    "cwe_ids":  [
        "CWE-863"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-06-29T23:09:22Z",
    "nvd_published_at":  "2026-05-22T17:16:46Z",
    "severity":  "MODERATE"
}
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-r5vf-grcx-5vqp/GHSA-r5vf-grcx-5vqp.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-r5vf-grcx-5vqp/GHSA-r5vf-grcx-5vqp.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-r5vf-grcx-5vqp/GHSA-r5vf-grcx-5vqp.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-r5vf-grcx-5vqp/GHSA-r5vf-grcx-5vqp.json"
github.com/mattermost/mattermost-plugin-github

Package

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

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.0.1-0.20260318132218-6e6b740c4852

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-r5vf-grcx-5vqp/GHSA-r5vf-grcx-5vqp.json"