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TI-2025-33781 Aliases CVE-2025-53909

mailcow: dockerized vulnerable to SSTI in Quota and Quarantine Notification Template

Priority MEDIUM 40CWE-1336Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-1336.

Summary

mailcow: dockerized is an open source groupware/email suite based on docker. A Server-Side Template Injection (SSTI) vulnerability exists in versions prior to 2025-07 in the notification template system used by mailcow for sending quota and quarantine alerts. The template rendering engine allows template expressions that may be abused to execute code in certain contexts. The issue requires admin-level access to mailcow UI to configure templates, which are automatically rendered during normal system operation. Version 2025-07 contains a patch for the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00537 45th percentileScored 2026-11-07
Fix Fixed mailcow-dockerized (mailcow): 2025-07

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
mailcowmailcow-dockerizedbefore 2025-072025-07Patch availableCNA
  • mailcow-dockerized Vendormailcow Affected before 2025-07 Fixed in 2025-07 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mailcow:mailcow\:_dockerized:*:*:*:*:*:*:*:*_dockerizedVulnerablemailcow
  • cpe:2.3:a:mailcow:mailcow\:_dockerized:*:*:*:*:*:*:*:* Versions _dockerized Vulnerable ·mailcow

Remediation

  • Fix · CNA mailcow-dockerized (mailcow) Fixed in 2025-07

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-53909

References

Patch 1

Advisory 1

  • TI-2022-13182 OS Command Injection in mailcow CVSS 3.1HIGH 8.8
  • TI-2022-18634 mailcow-dockerized critical information misrepresentation can lead to phishing attacks through Swagger UI CVSS 3.1HIGH 8.2
  • TI-2024-15818 mailcow ipixel flood attack leads to Denial of Service in admin page CVSS 3.1MEDIUM 4.7
  • TI-2024-20015 mailcow Path Traversal and Arbitrary Code Execution Vulnerability CVSS 3.1MEDIUM 6.2
  • TI-2023-11637 mailcow is vulnerable to shell command injection via xoauth2 authentication in imapsync​ CVSS 3.1HIGH 8.8
  • TI-2022-13278 mailcow before 2022-05d allows a remote authenticated user to inject OS commands and… CVSS 3.1HIGH 8.8
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences