Timing Attack Vulnerability in Mattermost Plugin and Server by Mattermost
CVE-2025-27936

5.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 April 2025

What is CVE-2025-27936?

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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Affected Version(s)

Mattermost 10.5.0 <= 10.5.1

Mattermost 10.6.0

Mattermost 10.5.2

References

https://mattermost.com/security-updates

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Juho Forsén
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