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Vendor Solution
Update Mattermost to versions 11.7.0, 11.6.1, 11.5.4, 11.4.5, 10.11.15 or higher.
Tracking
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| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-r5vf-grcx-5vqp | Mattermost allows authenticated users to gain access to private repositories |
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
|
Tue, 26 May 2026 13:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mattermost mattermost Server
|
|
| CPEs | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mattermost mattermost Server
|
Fri, 22 May 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mattermost
Mattermost mattermost |
|
| Vendors & Products |
Mattermost
Mattermost mattermost |
Fri, 22 May 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Fri, 22 May 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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 | |
| Title | GitHub OAuth Scope Validation | |
| Weaknesses | CWE-863 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-05-22T16:56:09.671Z
Reserved: 2026-03-10T13:45:39.998Z
Link: CVE-2026-28735
Updated: 2026-05-22T16:55:49.531Z
Status : Analyzed
Published: 2026-05-22T17:16:46.260
Modified: 2026-06-17T10:28:58.320
Link: CVE-2026-28735
No data.
OpenCVE Enrichment
Updated: 2026-05-22T17:30:06Z
Github GHSA