P4Verified

CVE-2026-16453: Mattermost 11.10.0 through 11.10.0, 11.7.0 through 11.7.9, 11.9.0 through 11.9.1, 11.8.0 through 11.8.5

CVE-2026-16453. CVSS 3.1 base score 7.1 (HIGH, Vendor/CNA).

Affected technology

Mattermost · 11.10.0 through 11.10.0, 11.7.0 through 11.7.9, 11.9.0 through 11.9.1, 11.8.0 through 11.8.5
Mattermost

Description’s affected range: versions 11.10.x <= 11.10.0

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

An authenticated SAML user can join any team, including invite-only teams, via forging the team_id or invite_id fields in the RelayState. Vendor/CNA’s CVSS 3.1 assessment (base score 7.1/10) rates confidentiality impact as high; integrity impact as low; availability impact as none.

Published 16-Oct-2026 09:25 UTC

CWE: CWE-472
CCR priority: 28.4 /100 (P4)
CVSS 3.1: 7.1 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N · Vendor/CNA
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-16 09:25:50.391882+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-16453.html