Detections
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SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-mp6x-97xj-9x62)

critical Tenable Self-Hosted Container Security Plugin ID 437153

Description

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

 - Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to
 verify that the token used during the code exchange originates from the same authentication flow, which
 allows an authenticated user to perform account takeover via a specially crafted email address used when
 switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The
 vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and
 RequireEmailVerification to be disabled (default: disabled). (CVE-2025-12421)

See Also

https://github.com/advisories/GHSA-mp6x-97xj-9x62

Plugin Details

Severity: Critical

ID: 437153

Version: Revision 1.2

Type: Local

Family: SCA Checks

Published: 1/28/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.39

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2025-12421

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 8.6

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 11/27/2025

Vulnerability Publication Date: 11/27/2025

Reference Information

CVE: CVE-2025-12421