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CVE PROGRAM SOURCE RECORD6.4 Medium

CVE-2026-6673

Mattermost Jira plugin had unauthenticated {{/ac/installed}} lifecycle callback during pending Jira Cloud install

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Status
Published
Published
Updated
Assigning organization
Mattermost

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 11.7.0 to ≤ 11.7.0affected
  • 11.6.0 to ≤ 11.6.2affected
  • 11.5.0 to ≤ 11.5.5affected
  • 10.11.0 to ≤ 10.11.17affected
  • 11.8.0unaffected
  • 11.7.1unaffected
  • 11.6.3unaffected
  • 11.5.6unaffected
  • 10.11.18unaffected

References