Read the docs
TI-2025-31216 Aliases CVE-2025-49136GHSA-jc7g-x28f-3v3h

listmonk's Sprig template Injection vulnerability leads to reading of Environment Variable for low privilege user

Priority HIGH 74CWE-1336Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
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 and GitHub. Impact type from CWE-1336.

Summary

listmonk is a standalone, self-hosted, newsletter and mailing list manager. Starting in version 4.0.0 and prior to version 5.0.2, the `env` and `expandenv` template functions which is enabled by default in Sprig enables capturing of env variables on host. While this may not be a problem on single-user (super admin) installations, on multi-user installations, this allows non-super-admin users with campaign or template permissions to use the `{{ env }}` template expression to capture sensitive environment variables. Users should upgrade to v5.0.2 to mitigate the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01648 76th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed listmonk (knadh): 5.0.2github.com/knadh/listmonk (Go): 5.0.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
knadhlistmonk4.0.0 to before 5.0.25.0.2Patch availableCNA
—github.com/knadh/listmonk (Go)4.0.0 to before 5.0.25.0.2Patch availableGHSA-jc7g-x28f-3v3h
  • listmonk Vendorknadh Affected 4.0.0 to before 5.0.2 Fixed in 5.0.2 Patch available CNA
  • github.com/knadh/listmonk (Go) Vendor— Affected 4.0.0 to before 5.0.2 Fixed in 5.0.2 Patch available GHSA-jc7g-x28f-3v3h

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nadh:listmonk:*:*:*:*:*:*:*:*4.0.0 to before 5.0.2Vulnerableknadh
  • cpe:2.3:a:nadh:listmonk:*:*:*:*:*:*:*:* Versions 4.0.0 to before 5.0.2 Vulnerable ·knadh

Remediation

  • Fix · CNA listmonk (knadh) Fixed in 5.0.2
  • Fix · GHSA-jc7g-x28f-3v3h github.com/knadh/listmonk (Go) Fixed in 5.0.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-49136
  2. 2026-10-03 Alias added: GHSA-jc7g-x28f-3v3h

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2025-36190 listmonk Vulnerable to CSRF to XSS Chain That Can Lead to Admin Account Takeover CVSS 4.0HIGH 8.6
  • TI-2026-27072 listmonk: Active sessions remain valid after password reset and password change CVSS 3.1HIGH 7.1
  • TI-2026-17337 listmonk Vulnerable to Stored XSS Leading to Admin Account Takeover CVSS 4.0MEDIUM 5.4
  • TI-2025-28914 Listmonk v4.1.0 (fixed in v5.0.0) is vulnerable to SQL Injection in the QuerySubscribers… CVSS 3.1MEDIUM 6.5
  • TI-2026-26831 listmonk: Broken Access Control in CSV Import (Unauthorized List Assignment) CVSS 3.1MEDIUM 5.4

Sources

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