CVEvulnerability

CVE-2026-6673

6.4 MEDIUM Published 2026-06-22 Modified 2026-06-23 Official page ↗
Status
Analyzed
Published
2026-06-22
Last modified
2026-06-23
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.4 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H
Weaknesses
CWE-306

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 configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.18) • mattermost mattermost server (>= 11.5.0 < 11.5.6) • mattermost mattermost server (>= 11.6.0 < 11.6.3) • mattermost mattermost server (>= 11.7.0 < 11.7.1)

Related

Weakness · CWE (1)

  • CWE-306 Missing Authentication for Critical Functionality weakness

References