SecuriTricks - CVE-2026-3115

Description

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to apply view restrictions when retrieving group member IDs, which allows authenticated guest users to enumerate user IDs outside their allowed visibility scope via the group retrieval endpoint.. Mattermost Advisory ID: MMSA-2026-00594

Product(s) Impacted

Vendor	Product	Versions
Mattermost	Mattermost	11.2.0-11.2.2, 10.11.0-10.11.10, 11.4.0, 11.3.1

Weaknesses

Common security weaknesses mapped to this vulnerability.

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. This allows attackers to bypass intended access restrictions.

*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	11.2.0-11.2.2	/	/	/	/	/	/	/
a	mattermost	mattermost	10.11.0-10.11.10	/	/	/	/	/	/	/
a	mattermost	mattermost	11.4.0	/	/	/	/	/	/	/
a	mattermost	mattermost	11.3.1	/	/	/	/	/	/	/

References

https://mattermost.com/security-updates

CVSS Score

4.3 / 10

CVSS Data - 3.1

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

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

View Vector String

Timeline

Published: March 26, 2026, 5:16 p.m.
Last Modified: March 26, 2026, 5:16 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-3115