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Mattermost vulnerable to Observable Timing Discrepancy

Moderate severity GitHub Reviewed Published Apr 16, 2025 to the GitHub Advisory Database • Updated Apr 23, 2025

Package

gomod github.com/mattermost/mattermost-plugin-msteams (Go)

Affected versions

<= 1.15.0

Patched versions

2.1.0
gomod github.com/mattermost/mattermost/server/v8 (Go)
>= 10.5.0, < 10.5.2
< 8.0.0-20250314142426-c049748b8863
10.5.2
8.0.0-20250314142426-c049748b8863

Description

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.

References

Published by the National Vulnerability Database Apr 16, 2025
Published to the GitHub Advisory Database Apr 16, 2025
Reviewed Apr 16, 2025
Last updated Apr 23, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(11th percentile)

Weaknesses

CVE ID

CVE-2025-27936

GHSA ID

GHSA-2j87-p623-8cc2

Source code

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