Description
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.
Published: 2025-01-16
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

Vendor Solution

Update Mattermost to versions 10.3.0, 2.23.0, 10.2.1, 9.11.6, 10.0.4, 10.1.4 or higher.

Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2025-0107 Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.
Github GHSA Github GHSA GHSA-w6xh-c82w-h997 Mattermost webapp crash via a crafted post
References
History

Wed, 01 Oct 2025 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.2.0:-:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server

Thu, 16 Jan 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Thu, 16 Jan 2025 18:30:00 +0000

Type Values Removed Values Added
Description Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.
Title Webapp crash via object that can't be cast to String in Attachment Field
Weaknesses CWE-1287
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Mattermost Mattermost Mattermost Server
cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-01-16T18:57:02.927Z

Reserved: 2025-01-16T18:10:41.926Z

Link: CVE-2025-20621

cve-icon Vulnrichment

Updated: 2025-01-16T18:56:57.789Z

cve-icon NVD

Status : Analyzed

Published: 2025-01-16T19:15:29.960

Modified: 2025-10-01T17:54:41.760

Link: CVE-2025-20621

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-07-13T11:07:19Z

Weaknesses