CVE-2026-8823

LOW EPSS 13.9%

Published Jun 22, 20261w ago · Modified Jun 22, 20261w ago

3.8 CVSS 3.1

Low

Published Jun 22, 2026 1w ago

Last Modified Jun 22, 2026 1w ago

Description

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

CVSS Details

Base Score

3.8

Exploitability

1.2

Impact

2.5

Vector string

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L

Attack Vector Network

Attack Complexity Low

Privileges Required High

User Interaction None

Scope Unchanged

Confidentiality None

Integrity Low

Availability Low

Threat Intelligence

EPSS Exploit Probability

13.9% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-863 Incorrect Authorization Authorization

References 1

mattermost.com https://mattermost.com/security-updates

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.