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Mattermost Mattermost Plugin MSTeamsWebhook Secret Exposure via Timing attack in MSteams plugin

Risk 35
Severity
5.9
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

Remedy

Update Mattermost Plugin MSTeams to version 2.1.1 or Mattermost Server to versions 10.6.0, 10.5.2 or higher.
First published (updated )
CVE-2025-27936

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