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CVE-2026-6673

MEDIUM CVSS: 6.4 Published: 2026-06-22 Modified: 2026-06-23

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

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-306

References