CVE-2026-8823

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Source
https://cve.org/CVERecord?id=CVE-2026-8823
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8823.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-8823
Published
2026-06-22T13:41:28.404Z
Modified
2026-07-15T01:49:13.581967956Z
Severity
  • 3.8 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L CVSS Calculator
Summary
User Manager can demote bot accounts to guest without bot-management permission
Details

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-privileged administrator to degrade arbitrary bot accounts via the standard demote-user API.. Mattermost Advisory ID: MMSA-2026-00669

Database specific 
{
    "cwe_ids": [
        "CWE-863"
    ],
    "cna_assigner": "Mattermost",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8823.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "11.7.0"
                },
                {
                    "last_affected": "11.7.0"
                },
                {
                    "introduced": "10.11.0"
                },
                {
                    "last_affected": "10.11.17"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/mattermost/mattermost

Affected ranges

Type
GIT
Repo
https://github.com/mattermost/mattermost
Events
Introduced
5b955468ea1ea8b56c0fb10feb258a36a767d7bb
Fixed
79ba3d3d83ef1562d08ffd2d29d3d9cc2636a41c
Introduced
a9e574a82633915f22071f0d7ca2b006f249ec2a
Fixed
de117ab1cc09f4114aa7cb716fe760946ae7696c
Database specific 
{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "10.11.0"
        },
        {
            "fixed": "10.11.18"
        },
        {
            "introduced": "11.7.0"
        },
        {
            "fixed": "11.7.1"
        }
    ]
}

Affected versions

@mattermost/client@10.*
@mattermost/client@10.11.0
@mattermost/client@11.*
@mattermost/client@11.7.0
@mattermost/shared@11.*
@mattermost/shared@11.7.0
@mattermost/types@10.*
@mattermost/types@10.11.0
@mattermost/types@11.*
@mattermost/types@11.7.0
mattermost-redux@10.*
mattermost-redux@10.11.0
mattermost-redux@11.*
mattermost-redux@11.7.0
v10.*
v10.11.0
v10.11.0-rc3
v10.11.1
v10.11.1-rc1
v10.11.10
v10.11.11
v10.11.11-rc1
v10.11.11-rc2
v10.11.12
v10.11.13
v10.11.13-rc1
v10.11.14
v10.11.14-rc1
v10.11.15
v10.11.15-rc1
v10.11.16
v10.11.17
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
v11.*
v11.7.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8823.json"