PT-2026-51316 · Mattermost · Mattermost
Insomnia1102
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Published
2026-06-22
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Updated
2026-06-22
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CVE-2026-6673
CVSS v3.1
6.4
Medium
| Vector | AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H |
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
Fix
Missing Authentication
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Weakness Enumeration
Related Identifiers
Affected Products
Mattermost