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. 

Advisories
Source ID Title
EUVD EUVD EUVD-2023-2945 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. 
Github GHSA Github GHSA GHSA-c37r-v8jx-7cv2 Mattermost Uncontrolled Resource Consumption vulnerability
Fixes

Solution

Update Mattermost Server to versions 9.1.1, 9.0.2, 7.8.13, 8.1.4 or higher.


Workaround

No workaround given by the vendor.

References
History

Tue, 03 Jun 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-06-03T14:01:59.793Z

Reserved: 2023-11-22T11:18:57.610Z

Link: CVE-2023-40703

cve-icon Vulnrichment

Updated: 2024-08-02T18:38:51.081Z

cve-icon NVD

Status : Modified

Published: 2023-11-27T10:15:07.460

Modified: 2024-11-21T08:19:59.620

Link: CVE-2023-40703

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.