CVE-2025-10545: Github.com/mattermost/mattermost/server/v8 Mattermost Has An Incorrect Authorization Vulnerability
LOWCVE-2025-10545 is a LOW (CVSS 3.1) mattermost has an incorrect authorization vulnerability (CWE-863: Incorrect Authorization) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost has an incorrect authorization vulnerability. Remediation is available by upgrading affected packages to version 8.0.0-20250820115038-ff30b84049f0, 10.5.11, 10.11.3.
CVE-2025-10545 at a Glance
Security Impact
CVSS: 3.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).
How to Fix CVE-2025-10545
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 8.0.0-20250820115038-ff30b84049f0Upgrade github.com/mattermost/mattermost-server to 10.5.11Upgrade github.com/mattermost/mattermost-server to 10.11.3Run 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-2025-10545, 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 8.0.0-20250820115038-ff30b84049f0), 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. 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-2025-10545 Affected Github.com/mattermost/mattermost/server/v8 Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/mattermost/mattermost/server/v8
|
Go |
< 8.0.0-20250820115038-ff30b84049f0
|
8.0.0-20250820115038-ff30b84049f0
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 10.5.0
< 10.5.11
|
10.5.11
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 10.11.0
< 10.11.3
|
10.11.3
|
References
Frequently Asked Questions
What is CVE-2025-10545?
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
What version fixes CVE-2025-10545?
Is github.com/mattermost/mattermost/server/v8 affected?
Is github.com/mattermost/mattermost-server affected?
What is the CVSS score of CVE-2025-10545?
What CWE is associated with CVE-2025-10545?
How can I check Go dependencies for CVE-2025-10545?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-424h-xj87-m937",
"modified" : "2025-10-16T20:59:09Z",
"published" : "2025-10-16T09:30:24Z",
"aliases" : [ "CVE-2025-10545" ],
"summary" : "Mattermost has an Incorrect Authorization vulnerability",
"details" : "Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "8.0.0-20250820115038-ff30b84049f0"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.5.0"
}, {
"fixed" : "10.5.11"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.11.0"
}, {
"fixed" : "10.11.3"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-10545"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/pull/31319"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/pull/33827"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/commit/fb9c583f5e466a566a5122154ef337bbf2238902"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/commit/ff30b84049f0193f0570d30e46cffc3602298c67"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mattermost/mattermost"
}, {
"type" : "WEB",
"url" : "https://mattermost.com/security-updates"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-863" ],
"severity" : "LOW",
"github_reviewed" : true,
"github_reviewed_at" : "2025-10-16T20:59:09Z",
"nvd_published_at" : "2025-10-16T09:15:33Z"
}
}