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Advisories

mailcow: dockerized before 2026-11 Template Injection RCE via Domain-Wide Footer

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Severity
critical
Date
Affecting

  • mailcow: dockerized >= 0, < 2026-11

CWE
  • CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine
CVSS
9.4
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
Faceless0x7
Description
mailcow: dockerized before 2026-11 contains a server-side template injection vulnerability that allows domain administrators to execute commands in the shared rspamd container by storing a malicious domain-wide footer. Attackers can embed a Jinja macro with an os.execute default value, rendered by the rspamd MOO_FOOTER prefilter, to read or inject mail for every tenant and disable filtering.

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