CVE-2026-2476 PUBLISHED

MS Teams plugin sensitive config values not properly masked in support packets

Assigner: Mattermost
Reserved: 13.02.2026 Published: 16.03.2026 Updated: 16.03.2026

Mattermost Plugins versions <=2.0.3.0 fail to properly mask sensitive configuration values which allows an attacker with access to support packets to obtain original plugin settings via exported configuration data. Mattermost Advisory ID: MMSA-2026-00606

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N
CVSS Score: 7.6

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

CVSS 3.1

Product Status

Vendor	Mattermost
Product	Mattermost
Versions	Default: unaffected affected from 0 to 2.0.3 (incl.) Version 2.3.1.0 is unaffected

Solutions

Update Mattermost Plugins to versions 2.3.1.0 or higher.

Credits

Yash-Chakerverti finder

References

MMSA-2026-00606

Problem Types

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor CWE