CVE-2025-27538: Github.com/mattermost/mattermost/server/v8 Mattermost Missing Authentication For Critical Vulnerability
LOWCVE-2025-27538 is a LOW (CVSS 2.2) mattermost missing authentication for critical vulnerability (CWE-306: Missing Authentication for Critical Function) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost missing authentication for critical function. Remediation is available by upgrading affected packages to version 10.5.2, 9.11.10, 8.0.0-20250314142426-c049748b8863.
CVE-2025-27538 at a Glance
Security Impact
CVSS: 2.2
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N).
How to Fix CVE-2025-27538
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 10.5.2Upgrade github.com/mattermost/mattermost/server/v8 to 9.11.10Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250314142426-c049748b8863Run 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-2025-27538, 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 10.5.2), 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/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-2025-27538 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 |
≥ 10.5.0
< 10.5.2
|
10.5.2
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
≥ 9.11.0
< 9.11.10
|
9.11.10
|
|
github.com/mattermost/mattermost/server/v8
|
Go |
< 8.0.0-20250314142426-c049748b8863
|
8.0.0-20250314142426-c049748b8863
|
References
Frequently Asked Questions
What is CVE-2025-27538?
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
What version fixes CVE-2025-27538?
Is github.com/mattermost/mattermost/server/v8 affected?
What is the CVSS score of CVE-2025-27538?
What CWE is associated with CVE-2025-27538?
How can I check Go dependencies for CVE-2025-27538?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-j5jw-m2ph-3jjf",
"modified" : "2025-04-23T15:15:31Z",
"published" : "2025-04-16T09:32:13Z",
"aliases" : [ "CVE-2025-27538" ],
"summary" : "Mattermost Missing Authentication for Critical Function",
"details" : "Mattermost versions 10.5.x <= 10.5.1, 9.11.x <= 9.11.9 fail to enforce MFA checks in PUT /api/v4/users/user-id/mfa when the requesting user differs from the target user ID, which allows users with edit_other_users permission to activate or deactivate MFA for other users, even if those users have not set up MFA.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.5.0"
}, {
"fixed" : "10.5.2"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "9.11.0"
}, {
"fixed" : "9.11.10"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "8.0.0-20250314142426-c049748b8863"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-27538"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/mattermost/mattermost"
}, {
"type" : "WEB",
"url" : "https://mattermost.com/security-updates"
}, {
"type" : "WEB",
"url" : "https://pkg.go.dev/vuln/GO-2025-3620"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-306" ],
"severity" : "LOW",
"github_reviewed" : true,
"github_reviewed_at" : "2025-04-16T14:52:34Z",
"nvd_published_at" : "2025-04-16T08:15:14Z"
}
}