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CVE-2026-2476

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

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

CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Mattermost
Products
Ms Teams
CVE-2025-27936

Webhook Secret Exposure via Timing attack in MSteams plugin

Mattermost Plugin MSTeams versions <2.1.0 and Mattermost Server versions 10.5.x <=10.5.1 with the MS Teams plugin enabled fail to perform constant time comparison on a MSTeams plugin webhook secret which allows an attacker to retrieve the webhook secret of the MSTeams plugin via a timing attack during webhook secret comparison.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mattermost
Products
Mattermost Server Ms Teams