PT-2026-57661 · Mattermost · Mattermost
Published
2026-07-13
·
Updated
2026-07-13
·
CVE-2026-6850
CVSS v3.1
6.5
Medium
| Vector | AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
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
Fix
DoS
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Weakness Enumeration
Related Identifiers
Affected Products
Mattermost