CVE-2023-40703

Denial of Service via specially crafted block fields in Mattermost Boards

State: Published
Severity: 4.3 Medium
Published: Nov 27, 2023
Updated: Jun 3, 2025
Reserved: Nov 22, 2023

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L	Mattermost

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
MattermostMattermost	7.8.12 and earlierAffected 8.1.3 and earlierAffected 9.0.1 and earlierAffected 9.1.0 and earlierAffected 9.1.1Not affected 9.0.2Not affected 7.8.13Not affected 8.1.4Not affected

References

https://mattermost.com/security-updates

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