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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

PUBLISHED Reserved 2026-02-13 | Published 2026-03-16 | Updated 2026-03-17 | Assigner Mattermost




MEDIUM: 6.6CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

11.3.0 (semver)
affected

11.2.0 (semver)
affected

10.11.0 (semver)
affected

11.4.0
unaffected

11.3.1
unaffected

11.2.3
unaffected

10.11.11
unaffected

Credits

daw10 finder

References

mattermost.com/security-updates (MMSA-2025-00528) vendor-advisory

cve.org (CVE-2026-2462)

nvd.nist.gov (CVE-2026-2462)

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