CVE-2023-40703

MEDIUM

Mattermost < 7.8.12 and 9.1.0-9.1.1 - Denial of Service via Block Field String Injection

Title source: llm

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.

References (1)

Core 1

Core References

Vendor Advisory

https://mattermost.com/security-updates

Scores

CVSS v3 4.3

EPSS 0.0009

EPSS Percentile 25.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-400

Status published

Products (4)

mattermost/mattermost 9.1.0

mattermost/mattermost < 7.8.12

mattermost/mattermost 9.1.0 - 9.1.1Go

mattermost/mattermost-server 0 - 7.8.13Go

Published Nov 27, 2023

Tracked Since Feb 18, 2026