| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | ≥ 10.11.0, < 10.11.20≥ 11.6.0, < 11.6.5≥ 11.7.0, < 11.7.3 | 10.11.2011.6.511.7.3 |
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658
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