CVE-2025-20051: Github.com/mattermost/mattermost/server/v8 Mattermost Allows Reading Arbitrary Files Vulnerability
CRITICALCVE-2025-20051 is a CRITICAL (CVSS 9.9) mattermost allows reading arbitrary files vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost allows reading arbitrary files. Remediation is available by upgrading affected packages to version 8.0.0-20250122165010-4ed702ccff4e, 9.11.8, 10.2.3, 10.3.3, 10.4.2.
CVE-2025-20051 at a Glance
Security Impact
CVSS: 9.9
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
How to Fix CVE-2025-20051
To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost/server/v8 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250122165010-4ed702ccff4eUpgrade github.com/mattermost/mattermost/server/v8 to 9.11.8Upgrade github.com/mattermost/mattermost/server/v8 to 10.2.3Upgrade github.com/mattermost/mattermost/server/v8 to 10.3.3Upgrade github.com/mattermost/mattermost/server/v8 to 10.4.2Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/mattermost/mattermost/server/v8How to Check if You Are Affected
To determine whether your application is affected by CVE-2025-20051, inspect your project dependencies for Github.com/mattermost/mattermost/server/v8:
inspect dependencies for github.com/mattermost/mattermost/server/v8Analyze the terminal output to locate any version of Github.com/mattermost/mattermost/server/v8 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.0.0-20250122165010-4ed702ccff4e), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Github.com/mattermost/mattermost/server/v8, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2025-20051 Affected Github.com/mattermost/mattermost/server/v8 Versions
5 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/mattermost/mattermost/server/v8
|
Go |
< 8.0.0-20250122165010-4ed702ccff4e
|
8.0.0-20250122165010-4ed702ccff4e
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 9.11.0-rc1
< 9.11.8
|
9.11.8
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 10.2.0-rc1
< 10.2.3
|
10.2.3
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 10.3.0-rc1
< 10.3.3
|
10.3.3
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 10.4.0-rc1
< 10.4.2
|
10.4.2
|
References
Frequently Asked Questions
What is CVE-2025-20051?
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
What version fixes CVE-2025-20051?
Is github.com/mattermost/mattermost/server/v8 affected?
What is the CVSS score of CVE-2025-20051?
What CWE is associated with CVE-2025-20051?
How can I check Go dependencies for CVE-2025-20051?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-v469-7wp6-7cvp",
"modified" : "2025-02-24T18:28:22Z",
"published" : "2025-02-24T09:35:45Z",
"aliases" : [ "CVE-2025-20051" ],
"summary" : "Mattermost allows reading arbitrary files",
"details" : "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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "8.0.0-20250122165010-4ed702ccff4e"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "9.11.0-rc1"
}, {
"fixed" : "9.11.8"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.2.0-rc1"
}, {
"fixed" : "10.2.3"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.3.0-rc1"
}, {
"fixed" : "10.3.3"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.4.0-rc1"
}, {
"fixed" : "10.4.2"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-20051"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost-plugin-boards/commit/025ce8d363a054473bc002f43f602a4032d38c06"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/commit/4ed702ccff4ec3c9eff832a9b6060f9f4454141d"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mattermost/mattermost"
}, {
"type" : "WEB",
"url" : "https://mattermost.com/security-updates"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2025-02-24T18:28:21Z",
"nvd_published_at" : "2025-02-24T08:15:10Z"
}
}