Detections
Analytics

SCA: security update for github.com/mattermost/mattermost-server (GHSA-2xf7-hmf6-p64j)

low Tenable Cloud Security Plugin ID 437726

Description

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

 - Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data
 retrieval which allows a deactivated user to learn team names they should not have access to via a race
 condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549 (CVE-2026-20796)

See Also

https://github.com/advisories/GHSA-2xf7-hmf6-p64j

Plugin Details

Severity: Low

ID: 437726

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 2/14/2026

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: Low

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

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

CVSS Score Source: CVE-2026-20796

CVSS v3

Risk Factor: Low

Base Score: 3.1

Temporal Score: 2.7

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/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: 2/13/2026

Vulnerability Publication Date: 2/13/2026

Reference Information

CVE: CVE-2026-20796

cwe: CWE-367