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CVE-2026-12882

nvd nist
Published: Sep 14, 2026Modified: Oct 7, 2026

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4.3
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Exploitability: 2.8 / Impact: 1.4
Source: responsibledisclosure@mattermost.com (Secondary)

Description

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to parse Markdown autolinks with unmatched trailing closing parentheses in linear time, which allows an authenticated user with permission to create posts to cause excessive server CPU consumption and degrade availability for other users via specially crafted post or message attachment content. Mattermost Advisory ID: MMSA-2026-00703

Affected (4)

Mattermost
1 product
Mattermost Server
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Mattermost
Mattermost Server
10.11.0 ≤ version < 10.11.23
Mattermost Server
11.7.0 ≤ version < 11.7.8
Mattermost Server
11.8.0 ≤ version < 11.8.5
Mattermost Server
11.9.0 ≤ version < 11.9.1

Related CWEs

CWE-407
Inefficient Algorithmic Complexity
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

References (1)

Source: responsibledisclosure@mattermost.com
Vendor Advisory

Timeline

No history available yet.