Security Advisory

CVE-2026-6673

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-22 13:38:56

Last updated 2026-06-22 15:41:08

Assigner Mattermost

CVSS score 6.4

State PUBLISHED

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

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