CVE-2026-10106 | Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.1… | CVSS 6.5 MEDIUM

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690

Metadata

CVE ID: CVE-2026-10106
State: PUBLISHED
Assigner: Mattermost
Reserved: 2026-05-29 16:06 UTC
Published: 2026-07-13 08:09 UTC
Last updated: 2026-07-13 13:56 UTC
Primary CWE: CWE-863
CWE-863: Incorrect Authorization
Vendor / Product: Mattermost / Mattermost
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Mattermost	Mattermost	—	11.7.0 ≤ 11.7.2, 11.6.0 ≤ 11.6.4, 10.11.0 ≤ 10.11.19, 11.8.0 …

Weakness (CWE)

CWE	Source	Description
CWE-863	cna	CWE-863: Incorrect Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References (1)

MMSA-2026-00690 https://mattermost.com/security-updates