8.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-6346

CVE-2026-6346: Mattermost doesn't sanitize sensitive configuration fields before including them in support packet generation

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields before including them in support packet generation, which allows a Mattermost System Admin or any party with access to a support packet to obtain sensitive credentials in plaintext via downloading a support packet from the System Console.. Mattermost Advisory ID: MMSA-2026-00607

(GitHub Advisory)

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CVE-2026-6346

CVE-2026-6346:

8.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/mattermost/mattermost/server/v8	go	>= 11.5.0, < 11.5.2	11.5.2
github.com/mattermost/mattermost/server/v8	go	>= 10.11.0, < 10.11.14	10.11.14
github.com/mattermost/mattermost/server/v8	go	>= 11.4.0, < 11.4.4	11.4.4
github.com/mattermost/mattermost/server/v8	go	< 8.0.0-20260326202606-fac92f4a71f3	8.0.0-20260326202606-fac92f4a71f3
github.com/mattermost/mattermost-server	go	< 5.3.2-0.20260326202606-fac92f4a71f3	5.3.2-0.20260326202606-fac92f4a71f3

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is caused by the incomplete sanitization of sensitive configuration data within Mattermost. When a system administrator generates a support packet, the system configuration is included. The model.Config.Sanitize function is supposed to redact sensitive fields like passwords and API keys from this configuration data. The analysis of the patch commit fac92f4a71f356009e27983a980f729f599e8ba5 shows that this function was not sanitizing several fields, including ExportAmazonS3SecretAccessKey, ClientKey, GoogleDeveloperKey, and GiphySdkKey. The patch adds the necessary code to replace the values of these fields with a placeholder (FakeSetting). Therefore, any runtime profile taken during the generation of a support packet on a vulnerable version of Mattermost would show the model.Config.Sanitize function being executed, but failing to properly clean the configuration, thus leaking sensitive credentials.

Vulnerable functions

model.Config.Sanitize

server/public/model/config.go

The vulnerability lies in the `Sanitize` method of the `Config` struct. This function is responsible for redacting sensitive information from the configuration before it is included in support packets. The patch reveals that several fields (`ExportAmazonS3SecretAccessKey`, `ClientKey`, `GoogleDeveloperKey`, `GiphySdkKey`) were not being sanitized, meaning their plaintext values were exposed. The function was vulnerable because it was incomplete. The patch adds the missing sanitization logic for these fields.

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WAF Rule

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Reasoning

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