CVE-2025-20033: Github.com/mattermost/mattermost/server/v8 Mattermost Improper Validation Of Specified Vulnerability
MODERATECVE-2025-20033 is a MODERATE (CVSS 4.3) mattermost improper validation of specified vulnerability (CWE-1287: Improper Validation of Specified Type of Input) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost improper validation of specified type of input vulnerability. Remediation is available by upgrading affected packages to version 9.11.16, 10.0.4, 10.1.4, 10.2.1, 8.0.0-20250102081831-64c566a8280b.
CVE-2025-20033 at a Glance
Security Impact
CVSS: 4.3
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:U/C:N/I:N/A:L).
How to Fix CVE-2025-20033
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 9.11.16Upgrade github.com/mattermost/mattermost/server/v8 to 10.0.4Upgrade github.com/mattermost/mattermost/server/v8 to 10.1.4Upgrade github.com/mattermost/mattermost/server/v8 to 10.2.1Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250102081831-64c566a8280bRun 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-2025-20033, 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 9.11.16), 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-1287: Improper Validation of Specified Type of Input, where the product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type. 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-2025-20033 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 |
≥ 9.11.0
< 9.11.16
|
9.11.16
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 10.0.0
< 10.0.4
|
10.0.4
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 10.1.0
< 10.1.4
|
10.1.4
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 10.2.0
< 10.2.1
All 1 versions
10.2.0
|
10.2.1
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
< 8.0.0-20250102081831-64c566a8280b
|
8.0.0-20250102081831-64c566a8280b
|
References
Frequently Asked Questions
What is CVE-2025-20033?
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
What version fixes CVE-2025-20033?
Is github.com/mattermost/mattermost/server/v8 affected?
What is the CVSS score of CVE-2025-20033?
What CWE is associated with CVE-2025-20033?
How can I check Go dependencies for CVE-2025-20033?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-2549-xh72-qrpm",
"modified" : "2025-01-09T18:14:03Z",
"published" : "2025-01-09T09:31:42Z",
"aliases" : [ "CVE-2025-20033" ],
"summary" : "Mattermost Improper Validation of Specified Type of Input vulnerability",
"details" : "Mattermost versions 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post types, which allows attackers to deny service to users with the sysconsole_read_plugins permission via creating a post with the custom_pl_notification type and specific props.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "9.11.0"
}, {
"fixed" : "9.11.16"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.0.0"
}, {
"fixed" : "10.0.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.1.0"
}, {
"fixed" : "10.1.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.2.0"
}, {
"fixed" : "10.2.1"
} ]
} ],
"versions" : [ "10.2.0" ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "8.0.0-20250102081831-64c566a8280b"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-20033"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mattermost/mattermost"
}, {
"type" : "WEB",
"url" : "https://mattermost.com/security-updates"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-1287" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2025-01-09T18:14:03Z",
"nvd_published_at" : "2025-01-09T07:15:28Z"
}
}