CVEvulnerability

CVE-2026-12882

4.3 MEDIUM Published 2026-09-14 Modified 2026-10-07 Official page ↗
Status
Analyzed
Published
2026-09-14
Last modified
2026-10-07
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-407

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 configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.23) • mattermost mattermost server (>= 11.7.0 < 11.7.8) • mattermost mattermost server (>= 11.8.0 < 11.8.5) • mattermost mattermost server (>= 11.9.0 < 11.9.1)

Related

Weakness · CWE (1)

  • CWE-407 Inefficient Algorithmic Complexity weakness

References