Detections
Analytics

SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-3c9r-7f29-qp32)

medium Tenable Cloud Security Plugin ID 437905

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate login
 method restrictions which allows an authenticated user to bypass SSO-only login requirements via userID-
 based authentication. Mattermost Advisory ID: MMSA-2025-00548 (CVE-2026-0999)

See Also

https://github.com/advisories/GHSA-3c9r-7f29-qp32

Plugin Details

Severity: Medium

ID: 437905

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 2/20/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N

CVSS Score Source: CVE-2026-0999

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 2/16/2026

Vulnerability Publication Date: 2/16/2026

Reference Information

CVE: CVE-2026-0999

cwe: CWE-303