CVE-2025-6226: Github.com/mattermost/mattermost server Mattermost Missing Authentication For Critical Vulnerability
MODERATECVE-2025-6226 is a MODERATE (CVSS 6.5) mattermost missing authentication for critical vulnerability (CWE-306: Missing Authentication for Critical Function) affecting Github.com/mattermost/mattermost server libraries in the Go ecosystem. The issue involves mattermost missing authentication for critical function. Remediation is available by upgrading affected packages to version 10.5.7, 10.8.2, 10.7.4, 9.11.17, 8.0.0-20250520130510-fa40a8c5d47f.
CVE-2025-6226 at a Glance
Security Impact
CVSS: 6.5
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:H/I:N/A:N).
How to Fix CVE-2025-6226
To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost server 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 to 10.5.7Upgrade github.com/mattermost/mattermost-server to 10.8.2Upgrade github.com/mattermost/mattermost-server to 10.7.4Upgrade github.com/mattermost/mattermost-server to 9.11.17Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250520130510-fa40a8c5d47fRun the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/mattermost/mattermost-serverHow to Check if You Are Affected
To determine whether your application is affected by CVE-2025-6226, inspect your project dependencies for Github.com/mattermost/mattermost server:
inspect dependencies for github.com/mattermost/mattermost-serverAnalyze the terminal output to locate any version of Github.com/mattermost/mattermost server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.5.7), 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-306: Missing Authentication for Critical Function, where the product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. In Github.com/mattermost/mattermost server, 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-2025-6226 Affected Github.com/mattermost/mattermost server Versions
5 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 10.5.0
< 10.5.7
|
10.5.7
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 10.8.0
< 10.8.2
|
10.8.2
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 10.7.0
< 10.7.4
|
10.7.4
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 9.11.0
< 9.11.17
|
9.11.17
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
< 8.0.0-20250520130510-fa40a8c5d47f
|
8.0.0-20250520130510-fa40a8c5d47f
|
References
Frequently Asked Questions
What is CVE-2025-6226?
Which Github.com/mattermost/mattermost server versions are affected?
What version fixes CVE-2025-6226?
Is github.com/mattermost/mattermost-server affected?
Is github.com/mattermost/mattermost/server/v8 affected?
What is the CVSS score of CVE-2025-6226?
What CWE is associated with CVE-2025-6226?
How can I check Go dependencies for CVE-2025-6226?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-7h34-9chr-58qh",
"modified" : "2025-07-21T18:32:07Z",
"published" : "2025-07-18T09:30:32Z",
"aliases" : [ "CVE-2025-6226" ],
"summary" : "Mattermost Missing Authentication for Critical Function",
"details" : "Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.5.0"
}, {
"fixed" : "10.5.7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.8.0"
}, {
"fixed" : "10.8.2"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.7.0"
}, {
"fixed" : "10.7.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "9.11.0"
}, {
"fixed" : "9.11.17"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "8.0.0-20250520130510-fa40a8c5d47f"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-6226"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/commit/fa40a8c5d47fed5c166429a1c1bd95d62b241d89"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mattermost/mattermost"
}, {
"type" : "WEB",
"url" : "https://mattermost.com/security-updates"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-306" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2025-07-21T18:32:06Z",
"nvd_published_at" : "2025-07-18T09:15:26Z"
}
}