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Mattermost webapp crash via a crafted post

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

Package

gomod github.com/mattermost/mattermost/server/v8 (Go)

Affected versions

>= 10.2.0, < 10.2.1
>= 10.1.0, <= 10.1.3
>= 10.0.0, <= 10.0.3
>= 9.11.0, <= 9.11.5
< 8.0.0-20241127161322-25ff7a3779a5

Patched versions

10.2.1
10.1.4
10.0.4
9.11.6
8.0.0-20241127161322-25ff7a3779a5

Description

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.

References

Published by the National Vulnerability Database Jan 16, 2025
Published to the GitHub Advisory Database Jan 16, 2025
Reviewed Jan 16, 2025
Last updated Jan 16, 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
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.043%
(11th percentile)

Weaknesses

CVE ID

CVE-2025-20621

GHSA ID

GHSA-w6xh-c82w-h997

Source code

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