Analysis and contextual insights are available on OpenCVE Cloud.
Vendor Solution
Update Mattermost to versions 11.8.0, 11.7.1, 11.6.3, 11.5.6, 10.11.18 or higher.
Tracking
Sign in to view the affected projects.
No advisories yet.
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
|
Mon, 22 Jun 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Mon, 22 Jun 2026 16:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mattermost
Mattermost mattermost |
|
| Vendors & Products |
Mattermost
Mattermost mattermost |
Mon, 22 Jun 2026 13:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654 | |
| Title | Mattermost Jira plugin had unauthenticated {{/ac/installed}} lifecycle callback during pending Jira Cloud install | |
| Weaknesses | CWE-306 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-06-22T15:41:08.511Z
Reserved: 2026-04-20T13:45:33.430Z
Link: CVE-2026-6673
Updated: 2026-06-22T15:41:01.960Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-06-22T15:45:03Z