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CVE-2025-25279 — Vulnerability in...

CRITICAL

Mattermost allows reading arbitrary files related to importing boards

Published February 24, 2025Updated September 10, 2026Source: osv

Summary

Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate board blocks when importing boards which allows an attacker could read any arbitrary file on the system via importing and exporting a specially crafted import archive in Boards.

Advisory Timeline

  • First published February 24, 2025 (595 days ago).
  • Last revised September 10, 2026 — 563 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update github.com/mattermost/mattermost/server/v8 to 10.3.3 or later
go get github.com/mattermost/mattermost/server/v8@v10.3.3
Go
Update github.com/mattermost/mattermost/server/v8 to 10.4.2 or later
go get github.com/mattermost/mattermost/server/v8@v10.4.2
Go
Update github.com/mattermost/mattermost/server/v8 to 8.0.0-20250122165010-4ed702ccff4e or later
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20250122165010-4ed702ccff4e
Go
Update github.com/mattermost/mattermost/server/v8 to 10.2.3 or later
go get github.com/mattermost/mattermost/server/v8@v10.2.3
Go
Update github.com/mattermost/mattermost/server/v8 to 9.11.8 or later
go get github.com/mattermost/mattermost/server/v8@v9.11.8

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (5)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
github.com/mattermost/mattermost/server/v8
go
All versions10.3.3
github.com/mattermost/mattermost/server/v8
go
All versions10.4.2
github.com/mattermost/mattermost/server/v8
go
All versions8.0.0-20250122165010-4ed702ccff4e
github.com/mattermost/mattermost/server/v8
go
All versions10.2.3
github.com/mattermost/mattermost/server/v8
go
All versions9.11.8

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.9 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2025-25279?
Mattermost allows reading arbitrary files related to importing boards This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.9/10).
How do I check if my project is affected by CVE-2025-25279?
CVE-2025-25279 affects github.com/mattermost/mattermost/server/v8. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-25279 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.9

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-5fwx-p6xh-vjrh
GO-2025-3480

Related CVEs

  • CVE-2025-12419
    CRITICAL

    Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication

  • CVE-2024-39274
    CRITICAL

    Mattermost failed to properly validate that the channel that comes from the sync message is a shared channel

  • CVE-2026-3108
    HIGH

    Mattermost allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape sequences

  • CVE-2026-7387
    HIGH

    Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints

  • CVE-2025-58073
    HIGH

    Mattermost has a Missing Authorization vulnerability

  • CVE-2026-6961
    HIGH

    Mattermost doesn't sanitize FileInfo.Name received from federated peers during shared channel file sync

  • CVE-2026-6346
    HIGH

    Mattermost doesn't sanitize sensitive configuration fields before including them in support packet generation

  • CVE-2026-24458
    HIGH

    Mattermost fails to properly handle very long passwords

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