CVE-2026-9816

EPSS 0.25%
Veröffentlicht 17.08.2026 22:05:24
Zuletzt bearbeitet 19.08.2026 13:29:28
Erkennungen
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Insufficient server-side validation of board member role fields permits privilege escalation

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fail to validate BoardMember.Scheme* fields server-side on insert and archive-import paths which allows a board editor or non-guest team member to grant board admin to arbitrary users via POST /api/v2/boards/{boardID}/members and POST /api/v2/teams/{teamID}/archive/import.. Mattermost Advisory ID: MMSA-2026-00685

Betroffene Produkte Warnungen 0 Metriken 2 CWE 1 Referenzen 4

NVD 3 VulnDex Vulnerability Enrichment 1

Daten sind bereitgestellt durch National Vulnerability Database (NVD)

Mattermost ≫ Mattermost Server Version >= 10.11.0 < 10.11.22

Mattermost ≫ Mattermost Server Version >= 11.7.0 < 11.7.7

Mattermost ≫ Mattermost Server Version >= 11.8.0 < 11.8.4

VulnDex Vulnerability Enrichment

Diese Information steht angemeldeten Benutzern zur Verfügung.

Zu dieser CVE wurde keine Warnung gefunden.

EPSS Metriken
Typ	Quelle	Score	Percentile
EPSS	FIRST.org	0.25%	0.16

CVSS Metriken
Quelle	Base Score	Exploit Score	Impact Score	Vector String
responsibledisclosure@mattermost.com	8.3	2.8	5.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

CWE-863 Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

https://mattermost.com/security-updates

Vendor Advisory

https://nvd.nist.gov/vuln/detail/CVE-2026-9816

CVE Source (NVD)

https://cveawg.mitre.org/api/cve/CVE-2026-9816

CVE Source (JSON)

https://euvd.enisa.europa.eu/vulnerability/CVE-2026-9816

EUVD

Team-orientierte Vulnerability Management Plattform

Features der Plattform

CVE-2026-9816