CVE-2023-40703

MEDIUM4.3EPSS 0.09%

Mattermost Uncontrolled Resource Consumption vulnerability

Published: 11/27/2023Modified: 2/4/2026

Also known as:GHSA-c37r-v8jx-7cv2CGA-rf23-3r6f-fwww

Description

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.

Affected packages (2)

Go/github.com/mattermost/mattermost-server/v6from 0, < 7.8.13
Go/github.com/mattermost/mattermost/server/v8>= 9.1.0, < 9.1.1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

References (3)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2023-40703
PATCHhttps://github.com/mattermost/mattermost
WEBhttps://mattermost.com/security-updates