Timing Attack Vulnerability in Mattermost Plugin and Server by Mattermost

CVE-2025-27936

Summary

The Mattermost MSTeams plugin and Mattermost Server versions specified are vulnerable due to inadequate handling of webhook secret comparisons. This oversight allows attackers to exploit the timing differences in secret verification, leading to the potential exposure of the webhook secret. An attacker could initiate a series of strategically timed requests to ascertain the correct secret through a method known as timing attack. This vulnerability emphasizes the need for robust security practices in plugin development.

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