CVE-2026-26230

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Source

https://cve.org/CVERecord?id=CVE-2026-26230

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26230.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-26230

Published

2026-03-16T20:19:51Z

Modified

2026-08-12T03:51:17Z

Severity

3.8 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N CVSS Calculator

Summary

Team Admin Privilege Escalation to Demote Members to Guest

Details

Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role. Mattermost Advisory ID: MMSA-2025-00531

Database specific

{
    "cna_assigner":  "Mattermost",
    "cwe_ids":  [
        "CWE-863"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26230.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "10.11.0"
                },
                {
                    "last_affected":  "10.11.10"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

Git / github.com/mattermost/mattermost

Affected ranges

Type

GIT

Repo

https://github.com/mattermost/mattermost

Events

Introduced

5b955468ea1ea8b56c0fb10feb258a36a767d7bb

Fixed

fddd4a70bcb32eaff394a2fa5399efcd1b2ae251

Database specific

Show details

{
    "cpe":  "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "10.11.0"
        },
        {
            "fixed":  "10.11.11"
        }
    ],
    "source":  "CPE_RANGE"
}

Affected versions

@mattermost/client@10.*

@mattermost/client@10.11.0

@mattermost/types@10.*

@mattermost/types@10.11.0

mattermost-redux@10.*

mattermost-redux@10.11.0

v10.*

v10.11.0

v10.11.0-rc3

v10.11.1

v10.11.1-rc1

v10.11.10

v10.11.11-rc1

v10.11.2

v10.11.2-rc1

v10.11.2-rc2

v10.11.3

v10.11.4

v10.11.4-rc1

v10.11.4-rc2

v10.11.4-rc3

v10.11.5

v10.11.6

v10.11.7

v10.11.8

v10.11.9

v10.11.9-rc1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26230.json"