Skip to content

Mattermost allows authenticated users to write files to arbitrary locations

Critical severity GitHub Reviewed Published Jun 20, 2025 to the GitHub Advisory Database • Updated Jun 20, 2025

Package

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

Affected versions

< 0.0.0-20250519205859-65aec10162f6

Patched versions

0.0.0-20250519205859-65aec10162f6
gomod github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20250519205859-65aec10162f6
>= 10.5.0, <= 10.5.5
>= 9.11.0, <= 9.11.15
= 10.8.0
>= 10.7.0, <= 10.7.2
>= 10.6.0, <= 10.6.5
8.0.0-20250519205859-65aec10162f6
10.5.6
9.11.16
10.8.1
10.7.3
10.6.6

Description

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to sanitize filenames in the archive extractor which allows authenticated users to write files to arbitrary locations on the filesystem via uploading archives with path traversal sequences in filenames, potentially leading to remote code execution. The vulnerability impacts instances where file uploads and document search by content is enabled (FileSettings.EnableFileAttachments = true and FileSettings.ExtractContent = true). These configuration settings are enabled by default.

References

Published by the National Vulnerability Database Jun 20, 2025
Published to the GitHub Advisory Database Jun 20, 2025
Reviewed Jun 20, 2025
Last updated Jun 20, 2025

Severity

Critical

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
Changed
Confidentiality
High
Integrity
High
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:C/C:H/I:H/A:H

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.
(50th percentile)

Weaknesses

Uncontrolled Search Path Element

The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. Learn more on MITRE.

CVE ID

CVE-2025-4981

GHSA ID

GHSA-qh58-9v3j-wcjc

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.