CVE-2026-6673

CVSS Score & Metrics

Base Score

6.4 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H                                    

Vulnerability 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

Vulnerability Details

Published Date

June 22, 2026

Last Modified

June 22, 2026

CWE ID

CWE-306

Source

NVD

External References

https://mattermost.com/security-updates

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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