Vulnerability details
CVE-2026-125757
mailcow mailcow-dockerized
mailcow: dockerized before 2026-11 Template Injection RCE via Domain-Wide Footer
CVSS 4.0
9.4Critical
Remedy
Versions not listed as affected in the CVE record:
- mailcow-dockerized — version 2026-11 and later
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.4Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| mailcow | mailcow-dockerized | v < 2026-11 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://github.com/mailcow/mailcow-dockerized/commit/e986803980db8b29435a2ddba5d9760737a818e3 patch
- https://github.com/mailcow/mailcow-dockerized/releases/tag/2026-11 release-notes
- https://github.com/mailcow/mailcow-dockerized/blob/55982ac74bfd35581cc44b122ab5fc659e3ae90a/data/conf/rspamd/lua/rspamd.local.lua#L847-L850 technical-description
- https://www.vulncheck.com/advisories/mailcow-dockerized-before-2026-11-template-injection-rce-via-domain-wide-footer third-party-advisory
- https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-jgr3-fv33-x43c vendor-advisory
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Details
- Published
- 2026-11-10
- Last updated
- 2026-11-10
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 29 · Low
Exploit prediction (EPSS)
0.82%
Probability of exploitation in 30 days
57.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-1336Improper Neutralization of Special Elements Used in a Template Engine