CVE-2026-125757

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

Published Nov 10, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title mailcow: dockerized before 2026-11 Template Injection RCE via Domain-Wide Footer
First Time appeared Mailcow
Mailcow mailcow\
Weaknesses CWE-1336
CPEs cpe:2.3:a:mailcow:mailcow\:_dockerized:*:*:*:*:*:*:*:*
Vendors & Products Mailcow
Mailcow mailcow\
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.4, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 10, 2026, 4:39 PM
Reserved
Nov 10, 2026, 12:36 PM
Status
Awaiting Analysis
Published
Nov 10, 2026, 4:17 PM
Modified
Nov 12, 2026, 8:57 PM