CVE-2025-20051
Arbitrary file read via block duplication in Mattermost Boards
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Arbitrary file read via block duplication in Mattermost Boards
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.
- Record
CVE-2025-20051- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-22
- Updated
- 2026-11-02
EUVDEUVD-2025-4306
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.
- Record
EUVD-2025-4306- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-v469-7wp6-7cvp
Mattermost allows reading arbitrary files
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.
- Record
GHSA-v469-7wp6-7cvp- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-22
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-20051- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
OSV
Arbitrary file read via block duplication in Mattermost Boards
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.
- Record
CVE-2025-20051- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-22
- Updated
- 2026-11-02
OSVGHSA-v469-7wp6-7cvp
Mattermost allows reading arbitrary files
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.
- Record
GHSA-v469-7wp6-7cvp- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-22
- Updated
- 2026-11-02
OSVGO-2025-3483No score
Mattermost allows reading arbitrary files in github.com/mattermost/mattermost-server
Mattermost allows reading arbitrary files in github.com/mattermost/mattermost-server
- Record
GO-2025-3483- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:14889-1No score
govulncheck-vulndb-0.0.20250312T181707-1.1 on GA media
These are all security issues fixed in the govulncheck-vulndb-0.0.20250312T181707-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:14889-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/mattermost/mattermost/server/v8Go | before 8.0.0-20250122165010-4ed702ccff4e | 8.0.0-20250122165010-4ed702ccff4e |
github.com/mattermost/mattermost/server/v8Go | 9.11.0-rc1 up to 9.11.8 | 9.11.8 |
github.com/mattermost/mattermost/server/v8Go | 10.2.0-rc1 up to 10.2.3 | 10.2.3 |
github.com/mattermost/mattermost/server/v8Go | 10.3.0-rc1 up to 10.3.3 | 10.3.3 |
github.com/mattermost/mattermost/server/v8Go | 10.4.0-rc1 up to 10.4.2 | 10.4.2 |
github.com/mattermost/mattermost-serverGo | 9.11.0-rc1+incompatible up to 9.11.8+incompatible, 10.2.0-rc1+incompatible up to 10.2.3+incompatible, 10.3.0-rc1+incompatible up to 10.3.3+incompatible, 10.4.0-rc1+incompatible up to 10.4.2+incompatible | 9.11.8+incompatible10.2.3+incompatible10.3.3+incompatible10.4.2+incompatible |
github.com/mattermost/mattermost-server/v5Go | All versions | None known |
github.com/mattermost/mattermost-server/v6Go | All versions | None known |
govulncheck-vulndbopenSUSE:Tumbleweed From an advisory covering 31 CVEs | before 0.0.20250312T181707-1.1 | 0.0.20250312T181707-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-20051 is a critical vulnerability (CVSS 9.9) in Mattermost, published February 24, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.61%, the 49th percentile. Fixed in github.com/mattermost/mattermost/server/v8 8.0.0-20250122165010-4ed702ccff4e.
References
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-20051
github.com/mattermost/mattermost-plugin-boards/commit/025ce8d363a054473bc002f43f602a4032d38c06
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suse.com/security/cve/CVE-2024-57603