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SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-pp9j-pf5c-659x)

medium Tenable Cloud Security Plugin ID 437903

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 sanitize sensitive data
 in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via
 profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560
 (CVE-2025-13821)

See Also

https://github.com/advisories/GHSA-pp9j-pf5c-659x

Plugin Details

Severity: Medium

ID: 437903

Version: Revision 1.7

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: 3

Percentile: 23.73

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2025-13821

CVSS v3

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 5

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/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: 2/16/2026

Vulnerability Publication Date: 2/16/2026

Reference Information

CVE: CVE-2025-13821

cwe: CWE-200