# CVE-2026-6346: Sensitive credentials exposed in plaintext in Mattermost support packets

> CVE-2026-6346: Sensitive credentials exposed in plaintext in Mattermost support packets. CVSS 8.7 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-6346
Last updated: 2026-10-14T20:10:00Z

- Published: 2026-05-18 08:37 UTC · Updated: 2026-10-14 20:10 UTC · Assigner: Mattermost
- CVSS: 8.7 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
- EPSS: 0.30%, 23th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-200

## Description

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

## Affected vendors and products

- Mattermost: Mattermost

## Tracked companies

- [Mattermost](https://rewindex.com/company/mattermost.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-6346)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-6346)
- [https://mattermost.com/security-updates](https://mattermost.com/security-updates)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-6346 · Markdown: https://rewindex.com/cve/CVE-2026-6346.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-6346 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:05.951Z