CVE-2023-40703 MEDIUM

CVE-2023-40703: Denial of Service via specially crafted block fields in Mattermost Boards

Vendor Mattermost
Product Mattermost
Weakness CWE-400
Published November 27, 2023
Last update June 3, 2025
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string. 

Key dates

02Disclosure timeline

November 27, 2023 CVE published
June 3, 2025 Record updated