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CVE-2026-6850

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CVSS 3.1
6.5 medium
EPSS
<1%p35
Published
()
Modified
Description

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

Vendors
mattermost
Products
mattermost server
Weakness
CWE-1333
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD CVE.org GitHub PoCs EPSS (0.4%)

In the news

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