# CVE-2026-2462: Admin RCE via Malicious Plugin Upload on CI Test Instances

> CVE-2026-2462: Admin RCE via Malicious Plugin Upload on CI Test Instances. CVSS 6.6 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-2462
Last updated: 2026-06-17T10:31:06Z

- Published: 2026-03-16 12:00 UTC · Updated: 2026-06-17 10:31 UTC · Assigner: Mattermost
- CVSS: 6.6 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
- EPSS: 0.34%, 27th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-863

## Description

Mattermost versions 11.3.x \<= 11.3.0, 11.2.x \<= 11.2.2, 10.11.x \<= 10.11.10 fail to restrict plugin installation on CI test instances with default admin credentials which allows an unauthenticated attacker to achieve remote code execution and exfiltrate sensitive configuration data including AWS and SMTP credentials via uploading a malicious plugin after changing the import directory. Mattermost Advisory ID: MMSA-2025-00528

## 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-2026-2462)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-2462)
- [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-2026-2462 · Markdown: https://rewindex.com/cve/CVE-2026-2462.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-2462 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:19.714Z