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
CVSS 6.4EPSS 0.299%Risk 0.66
View source- Published
- 2026-06-22 14:17:51
- Affected versions
- <= 11.7.0, <= 11.6.2, <= 11.5.5, <= 10.11.17
- Type
- Web application
- Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H