CVE-2025-64641: Github.com/mattermost/mattermost/server/v8 Mattermost Doesn't Verify That Post Vulnerability
MODERATECVE-2025-64641 is a MODERATE (CVSS 4.1) mattermost doesn't verify that post vulnerability (CWE-863: Incorrect Authorization) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost doesn't verify that post actions invoking `/share-issue-publicly` were created by the jira plugin. Remediation is available by upgrading affected packages to version 8.0.0-20251121122154-b57c297c6d7, 10.11.8, 10.12.4, 11.0.6, 11.1.1.
CVE-2025-64641 at a Glance
Security Impact
CVSS: 4.1
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:R/S:C/C:L/I:N/A:N).
How to Fix CVE-2025-64641
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 8.0.0-20251121122154-b57c297c6d7Upgrade github.com/mattermost/mattermost-server to 10.11.8Upgrade github.com/mattermost/mattermost-server to 10.12.4Upgrade github.com/mattermost/mattermost-server to 11.0.6Upgrade github.com/mattermost/mattermost-server to 11.1.1Run 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-2025-64641, 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 8.0.0-20251121122154-b57c297c6d7), 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-2025-64641 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 |
< 8.0.0-20251121122154-b57c297c6d7
|
8.0.0-20251121122154-b57c297c6d7
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 10.11.0
< 10.11.8
|
10.11.8
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 10.12.0
< 10.12.4
|
10.12.4
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 11.0.0
< 11.0.6
|
11.0.6
|
|
github.com/mattermost/mattermost-server
|
Go |
≥ 11.1.0
< 11.1.1
|
11.1.1
|
References
Frequently Asked Questions
What is CVE-2025-64641?
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
What version fixes CVE-2025-64641?
Is github.com/mattermost/mattermost/server/v8 affected?
Is github.com/mattermost/mattermost-server affected?
What is the CVSS score of CVE-2025-64641?
What CWE is associated with CVE-2025-64641?
How can I check Go dependencies for CVE-2025-64641?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-vww6-79rv-3j4x",
"modified" : "2026-02-27T22:04:50Z",
"published" : "2025-12-24T09:30:22Z",
"aliases" : [ "CVE-2025-64641" ],
"summary" : "Mattermost doesn't verify that post actions invoking `/share-issue-publicly` were created by the Jira plugin",
"details" : "Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost/server/v8"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "8.0.0-20251121122154-b57c297c6d7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.11.0"
}, {
"fixed" : "10.11.8"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "10.12.0"
}, {
"fixed" : "10.12.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "11.0.0"
}, {
"fixed" : "11.0.6"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/mattermost/mattermost-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "11.1.0"
}, {
"fixed" : "11.1.1"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-64641"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/pull/34551"
}, {
"type" : "WEB",
"url" : "https://github.com/mattermost/mattermost/commit/b57c297c6d7ae6812d85e32a625806ac9555deee"
}, {
"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-2026-4260"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-863" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2025-12-26T18:44:18Z",
"nvd_published_at" : "2025-12-24T08:15:46Z"
}
}