CVE-2025-12689: Github.com/mattermost/mattermost plugin calls Mattermost Fails To Check Websocket Vulnerability

MODERATE
Advisory Identifier: GHSA-j5vq-62gr-8v3r
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CVSS 6.5
CWE-1287
Published
Advisory Summary

CVE-2025-12689 is a MODERATE (CVSS 6.5) mattermost fails to check websocket vulnerability (CWE-1287: Improper Validation of Specified Type of Input) affecting Github.com/mattermost/mattermost plugin calls libraries in the Go ecosystem. The issue involves mattermost fails to check websocket request for proper utf-8 format potentially crashing calls plug-in. Remediation is available by upgrading affected packages to version 1.11.0.

CVE-2025-12689 at a Glance

CVE Identifier CVE-2025-12689
GHSA Identifier GHSA-j5vq-62gr-8v3r
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-1287: Improper Validation of Specified Type of Input
Affected Product Github.com/mattermost/mattermost plugin calls
Package Ecosystem Go
Published Date
Last Updated

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:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2025-12689

To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost plugin calls dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/mattermost/mattermost-plugin-calls fixed: 1.11.0 
Upgrade github.com/mattermost/mattermost-plugin-calls to 1.11.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/mattermost/mattermost-plugin-calls

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-12689, inspect your project dependencies for Github.com/mattermost/mattermost plugin calls:

inspect dependencies for github.com/mattermost/mattermost-plugin-calls

Analyze the terminal output to locate any version of Github.com/mattermost/mattermost plugin calls in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.11.0), 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 plugin calls, 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

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.

CVE-2025-12689 Affected Github.com/mattermost/mattermost plugin calls Versions

1 component(s)
Fixed Versions:
1.11.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/mattermost/mattermost-plugin-calls
golang/github.com/mattermost/mattermost-plugin-calls
Go
< 1.11.0
1.11.0

References

NVD — CVE-2025-12689 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-12689
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost-plugin-calls/commit/f68b41980e1274e05cf91c687e2af1a73c5e36ca
Github.com/mattermost/mattermost plugin calls Source Repository REPOSITORY
https://github.com/mattermost/mattermost
Github.com/mattermost/mattermost plugin calls Security Information SECURITY
https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2025-12689?
CVE-2025-12689 is a security vulnerability in Github.com/mattermost/mattermost plugin calls involving Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in under CWE-1287: Improper Validation of Specified Type of Input.
Which Github.com/mattermost/mattermost plugin calls versions are affected?
Affected versions include releases prior to 1.11.0 across affected packages: github.com/mattermost/mattermost-plugin-calls.
What version fixes CVE-2025-12689?
Upgrading to 1.11.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/mattermost/mattermost-plugin-calls affected?
Yes, github.com/mattermost/mattermost-plugin-calls is affected in releases prior to 1.11.0. Upgrade your dependency to 1.11.0 or later.
What is the CVSS score of CVE-2025-12689?
CVE-2025-12689 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2025-12689?
CVE-2025-12689 is classified under CWE-1287: Improper Validation of Specified Type of Input (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.).
How can I check Go dependencies for CVE-2025-12689?
Run the dependency tree command: 'inspect dependencies for github.com/mattermost/mattermost-plugin-calls'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j5vq-62gr-8v3r",
  "modified" : "2025-12-20T17:13:53Z",
  "published" : "2025-12-17T21:30:48Z",
  "aliases" : [ "CVE-2025-12689" ],
  "summary" : "Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in",
  "details" : "Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost-plugin-calls"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.11.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-12689"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost-plugin-calls/commit/f68b41980e1274e05cf91c687e2af1a73c5e36ca"
  }, {
    "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" : "2025-12-20T17:13:53Z",
    "nvd_published_at" : "2025-12-17T19:16:00Z"
  }
}