Vulnerabilities in pkg:golang/github.com/mattermost/mattermost-plugin-boards

PACKAGE
Advisory Identifier: GHSA-hf8w-x9h5-5gf9
Share
Advisory Summary

CVE-2026-2461 is a MODERATE (CVSS 4.3) mattermost boards plugin fails to vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Github.com/mattermost/mattermost plugin boards libraries in the Go ecosystem. The issue involves mattermost boards plugin fails to implement authorisation checks on comment block modifications. Remediation is available by upgrading affected packages to version 0.0.0-20260108044135-57c5be5b6ef5.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:golang/github.com/mattermost/mattermost-plugin-boards

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:golang/github.com/mattermost/mattermost-plugin-boards. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-hf8w-x9h5-5gf9 CVE-2026-2461 MODERATE Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications
GHSA-f72g-52v7-mg3p CVE-2025-9081 LOW Mattermost boards plugin fails to restrict download access to files

CVE-2026-2461 at a Glance

CVE Identifier CVE-2026-2461
GHSA Identifier GHSA-hf8w-x9h5-5gf9
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product Github.com/mattermost/mattermost plugin boards
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 4.3

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:L/A:N).

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 Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-2461

To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost plugin boards 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-boards fixed: 0.0.0-20260108044135-57c5be5b6ef5 
Upgrade github.com/mattermost/mattermost-plugin-boards to 0.0.0-20260108044135-57c5be5b6ef5
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-boards

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-2461, inspect your project dependencies for Github.com/mattermost/mattermost plugin boards:

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

Analyze the terminal output to locate any version of Github.com/mattermost/mattermost plugin boards in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.0-20260108044135-57c5be5b6ef5), 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-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In Github.com/mattermost/mattermost plugin boards, 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 Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559

CVE-2026-2461 Affected Github.com/mattermost/mattermost plugin boards Versions

1 component(s)
Fixed Versions:
0.0.0-20260108044135-57c5be5b6ef5
Product / Package Ecosystem Affected Versions Fixed Version
github.com/mattermost/mattermost-plugin-boards
golang/github.com/mattermost/mattermost-plugin-boards
Go
< 0.0.0-20260108044135-57c5be5b6ef5
0.0.0-20260108044135-57c5be5b6ef5

References

NVD — CVE-2026-2461 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-2461
Security Fix Commit FIX COMMIT
https://github.com/mattermost/mattermost-plugin-boards/commit/57c5be5b6ef59d02dd72e35094d1fae8ba6e9619
Github.com/mattermost/mattermost plugin boards Source Repository REPOSITORY
https://github.com/mattermost/mattermost-plugin-boards
Github.com/mattermost/mattermost plugin boards Security Information SECURITY
https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2026-2461?
CVE-2026-2461 is a security vulnerability in Github.com/mattermost/mattermost plugin boards involving Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications under CWE-639: Authorization Bypass Through User-Controlled Key.
Which Github.com/mattermost/mattermost plugin boards versions are affected?
Affected versions include releases prior to 0.0.0-20260108044135-57c5be5b6ef5 across affected packages: github.com/mattermost/mattermost-plugin-boards.
What version fixes CVE-2026-2461?
Upgrading to 0.0.0-20260108044135-57c5be5b6ef5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/mattermost/mattermost-plugin-boards affected?
Yes, github.com/mattermost/mattermost-plugin-boards is affected in releases prior to 0.0.0-20260108044135-57c5be5b6ef5. Upgrade your dependency to 0.0.0-20260108044135-57c5be5b6ef5 or later.
What is the CVSS score of CVE-2026-2461?
CVE-2026-2461 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-2461?
CVE-2026-2461 is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check Go dependencies for CVE-2026-2461?
Run the dependency tree command: 'inspect dependencies for github.com/mattermost/mattermost-plugin-boards'. 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-hf8w-x9h5-5gf9",
  "modified" : "2026-03-19T17:49:20Z",
  "published" : "2026-03-16T15:30:43Z",
  "aliases" : [ "CVE-2026-2461" ],
  "summary" : "Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications",
  "details" : "Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost-plugin-boards"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.0-20260108044135-57c5be5b6ef5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-2461"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mattermost/mattermost-plugin-boards/commit/57c5be5b6ef59d02dd72e35094d1fae8ba6e9619"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mattermost/mattermost-plugin-boards"
  }, {
    "type" : "WEB",
    "url" : "https://mattermost.com/security-updates"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-639" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-19T17:49:20Z",
    "nvd_published_at" : "2026-03-16T14:19:29Z"
  }
}