CVE-2025-14350 PUBLISHED

Information disclosure via channel mentions in posts

Assigner: Mattermost
Reserved: 09.12.2025 Published: 16.02.2026 Updated: 16.02.2026

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Mattermost
Product	Mattermost
Versions	Default: unaffected affected from 11.1.0 to 11.1.2 (incl.) affected from 10.11.0 to 10.11.9 (incl.) affected from 11.2.0 to 11.2.1 (incl.) Version 11.3.0 is unaffected Version 11.1.3 is unaffected Version 10.11.10 is unaffected Version 11.2.2 is unaffected

Solutions

Update Mattermost to versions 11.3.0, 11.1.3, 10.11.10, 11.2.2 or higher.

Credits

Harrison Healey finder

References

MMSA-2025-00563

Problem Types

CWE-862: Missing Authorization CWE