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EUVD-2026-243597

2026-10-02T21:14:14.682244+00:00

EUVD-2026-243597

fkie_cve-2025-49136

2026-10-02T21:14:14.682275+00:00

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.

GHSA-jc7g-x28f-3v3h — listmonk's Sprig template Injection vulnerability leads to reading of Environment Variable for low privilege user

2026-10-02T21:14:14.682308+00:00

Affected: Go: github.com/knadh/listmonk

### Summary The `env` and `expandenv` template functions which is enabled by default in [Sprig](https://masterminds.github.io/sprig/) enables capturing of env variables on the 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.

**Upgrade to [v5.0.2](https://github.com/knadh/listmonk/releases/tag/v5.0.2)** to mitigate.

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# Demonstration

### Description A critical template injection vulnerability exists in Listmonk's campaign preview functionality that allows authenticated users with minimal privileges (campaigns:get & campaigns:get_all) to extract sensitive system data, including database credentials, SMTP passwords, and admin credentials due to some dangerous function being allowed.

### Proof of Concept

- Create a user and give him `campaigns:get` and `campaigns:get_all` privileges

![image](https://github.com/user-attachments/assets/05333695-14d9-498e-9f73-2137d6eca55b)

- Now login with that user, go to any campaign, go the Content section and here lies the vulnerability, we're able to execute template content which allows us to get environment variables, execute Sprig functions...

- Now in the text field you can input the following and press Preview: ``` {{ env "AWS_KEY" }} {{ env "LISTMONK_db__user" }} {{ env "LISTMONK_db__password" }} ````…

openSUSE-SU-2025:15225-1 — govulncheck-vulndb-0.0.20250612T141001-1.1 on GA media

2026-10-02T21:14:14.682369+00:00

govulncheck-vulndb-0.0.20250612T141001-1.1 on GA media