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CVE-2025-20051 — Vulnerability in...

CRITICAL

Mattermost allows reading arbitrary files

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 input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block 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-2025-20051?
Mattermost allows reading arbitrary files 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-2025-20051?
CVE-2025-20051 affects github.com/mattermost/mattermost/server/v8. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-20051 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-v469-7wp6-7cvp
GO-2025-3483

Related CVEs

  • CVE-2024-39274
    CRITICAL

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

  • CVE-2025-12421
    CRITICAL

    Mattermost fails to to verify the token used during code exchange

  • CVE-2024-39777
    CRITICAL

    Mattermost allows unsolicited invites to expose access to local channels

  • CVE-2025-4981
    CRITICAL

    Mattermost allows authenticated users to write files to arbitrary locations

  • 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

  • CVE-2025-9079
    HIGH

    Mattermost Path Traversal vulnerability

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