SecuriTricks - CVE-2025-9076

Description

Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.

Product(s) Impacted

Vendor	Product	Versions
Mattermost	Mattermost Server	10.10.0-10.10.1, 10.10.*

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-862

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	mattermost	mattermost_server	10.10.0-10.10.1	/	/	/	/	/	/	/
a	mattermost	mattermost_server	10.10.*	/	/	/	/	/	/	/

References

https://mattermost.com/security-updates

CVSS Score

6.5 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: HIGH
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: NONE

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

View Vector String

Timeline

Published: Sept. 15, 2025, 10:15 a.m.
Last Modified: Sept. 15, 2025, 3:21 p.m.

Status : Undergoing Analysis

CVE is currently being analyzed by NVD staff, this process results in association of reference link tags, CVSS scores, CWE association, and CPE applicability statements.

More info

Source

responsibledisclosure@mattermost.com

CVE-2025-9076