| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0, < 10.11.18≥ 10.11.0+incompatible, < 10.11.18+incompatible≥ 11.5.0, < 11.5.6≥ 11.5.0+incompatible, < 11.5.6+incompatible≥ 11.6.0, < 11.6.3≥ 11.6.0+incompatible, < 11.6.3+incompatible≥ 11.7.0, < 11.7.1≥ 11.7.0+incompatible, < 11.7.1+incompatible | 10.11.1810.11.18+incompatible11.5.611.5.6+incompatible11.6.311.6.3+incompatible11.7.111.7.1+incompatible |
| mattermost server | ≥ 10.11.0, < 10.11.18≥ 11.5.0, < 11.5.6≥ 11.6.0, < 11.6.3≥ 11.7.0, < 11.7.1 | 10.11.1811.5.611.6.311.7.1 |
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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